British Gas

Definitely wouldn't recommend using British Gas, the salesman who did my quote didn't understand what he was doing, didn't order some things needed including the hot water tank!
I paid to have the new boiler moved to a new location but was informed by the contractors it was not possible due to how much work was involved…despite paying for it! I'm visually impaired so couldn't help with any of the required work, they were well aware of this from the start but didn't want to allow for my disability when it mattered.
The quote was loaded to the max with Labour charges, I paid for at least 38 man hours but it was done in less than a day. Mostly because they didn't want to do what was quoted for and I had paid for. I even stipulated I wanted a power flush to all radiators, again it was quoted for and paid for but instead all I got was one of the contractors banging the radiators with a hammer.
They don't all get warm again, a mere 7 days after.

Avoid British Gas, rip off.

Edit - As I say above, I'm visually impaired but you give me links and typed messages to speak to someone? Says it all really

Edit #2
It's now 10th March and still no help.
I rang about 2 days ago and was informed my complaint was in a queue, this might be 3 to 4 MONTHS until it gets looked at. How many complaints must they have!
I'm disabled and my heating system still isn't working correctly, absolutely no care from British Gas despite them trying to appear like a caring responsible company.
Avoid using British Gas at all costs, corporate money making machine with no customer care.

Unfortunately British Gas has become my supplier, after my previous energy company folded. BG has, without consultation or them following the Ofgem guidelines, put me onto a prepayment meter account. As a disabled person who cares for another disabled person, this clearly defines my household as vulnerable, but this did not stop BG cutting off my gas supply, I did not realise my Smart Meter was now converted to a prepayment meter, as I had not been consulted, that I needed to put credit onto my smart meter, so far over six phone calls, over three hours of trying to explain, emails to Chis OShea, my MP, Ofgem, still no joy at all.

Inept.

BG have yet again messed up our Direct Debit, Readings and Bill.
Over the last 4 days our account has shown 2 bills and 2 reversals of over £1k each. We've been in debit for over 1.5k, in credit for £55 and now in debit for £800! I sent our readings and they said they were wrong so they wouldn't use them to bill me so I sent photos of the meters. This is when the money merry-go-round began on the App. When I looked at our usage on the App for the last quarter it is sky high. The only way it could be this high is if a music festival was being run off our meter. Utterly ridiculous! Then I find out they've been taking £50 a month more than the agreed direct debit without informing me of the change. This is the 2nd time in 2 years they've made a huge blunder and I've wasted time trying to get hold of them with absolutely no luck. It's wearing and infuriating. Every time you go to Live Chat a notice pops as informing you that there's nobody available. Utter rubbish. Utter, utter rubbish. Sort it out British Gas! Just look at the review sites! It says it all!

Booked installation of Smart Metre 3 weeks ago, for between 1pm - 5pm today. The technician arrived at 4.30 and as soon as we opened the door she said she didn't think she could do it as she did not have the right equipment. When asked didn't they check they had the equipment in the morning before setting off on the appointments we were told she had only been given this appt 30 mins ago. When we asked when she would be returning she said she would not be WE would have to arrange another appointment. PRETTY POOR SERVICE IF YOU ASK ME. A TOTAL DISREGARD FOR CUSTOMERS.

App and website still not working to check how much you have on your meters over a year later. Clearly not bothered to fix them.

When I got pleurisy due to them cutting out my gas because my Smart Meter screen and app were showing that I had £15 on my gas when in fact I had nothing (So their fault) they said that someone will come the next day or two to turn my gas back on (I couldn't do it myself due to disabling health problems... With pleurisy on top of that). I had to scream cry over the phone to get them to turn my gas on the same day (It's been hours of pain in the middle of winter without heating. And I was on their priority services register due to disability. They don't care).

Now they were supposed to, a week ago, refund me £100 for what I had on my gas and electricity before moving house, and they were supposed to change my meters to my new place, plus delete my old address account. They didn't delete my old address account until I called them to ask why they haven't done that. They didn't refund me. And they put my neighbour's meters as my meters. And on top of that they told me that they'll call me back the same day, but three days later and they still haven't called me back. Huh... Seems to be a clear sign... Ableist much? No care towards disabled people. And clearly no care towards elderly people from the reviews that I read either (I don't have experience on the elderly side, I believe them though).

Hello I've just spoken a customer service person for British Gas who was very helpful about changing my supply

I have been a customer of British gas on the electric key meter side I have complained for years about how high our bills were and that we were being overcharged I have since found out after trying to leave them that my bill is double that to which a 2 bedroom property should be I gained a debt which we had been paying off and I asked for a settlement figure they then received my payment in full I explained that I was joining another company and not only did they not remove the debt but also blocked my move because of the debt I paid I have made more than 9 calls to British gas regarding this whole issue were I have been lied to and not received phone calls back when promised one.to make things worse they told me to top up with them again and when I put the key in the meter it would clear the debt I have tried this now at 2 different shops and spent 25 mins in the last trying to achieve this however to no avail in my experience the customer service is non existence and everything thing I told the people who answer in a far off land I had clearly just wasted my breath if you read this please take note so you don't encounter the problems I have had myself

UPDATE, THIS MAY BE A PUBLIC PLATFORM, BUT YOU HAVE MY ACCOUNT NUMBER AND YOU CAN ACCESS MY CONTACT DETAILS, JUST ANOTHER COP OUT BY BRITISH GAS! AS REGARDS YOUR CHAT ONLINE SERVICE, THEY CAN'T HELP AS PREVIOUSLY STATED! USELESS COMPANY! You know what is so frustrating? When you actually state in your review that you do not use any form of social media, or that you have contacted customer service and you clearly state that they can't help you either! THEN YOU GET A REPLY FROM THIS AWFUL INEPT COMPANY FROM A PERSON WHO HAS NOT READ THE REVIEW PROPERLY OR TAKEN ON BOARD YOUR COMMENTS, SO WE ARE NOW APPROACHING 70 DAYS SINCE MY FAULT WAS REPORTED BY YOUR ENGINEER. SO HERE'S A COPY OF YOUR REPLY, IT'S LAUGHABLE AND PATHETIC, BECAUSE NO-ONE AT BRITISH GAS ACTUALLY CARES... 1 REPLY FOR YOUR ENJOYMENT... UPDATE FROM LUCY, WHO HAS CLEARLY NOT READ AND UNDERSTOOD THE REVIEW, NO SOCIAL MEDIA USED BY ME. HER ADVICE USE FACEBOOK OR TWITTER TO PRIVATE MESSAGE THEM! OR I CAN CONTACT CUSTOMER SERVICE, WHO AS I'VE PREVIOUSLY STATED CAN'T HELP!
NICE ONE LUCY! YOU TOTALLY EPITOMISE THE SHEER INCOMPETENCE OF BRITISH GAS! YOU ARE A STAR! Oooohhh! I have a "complaint Handler"! So come on British Gas, since when do I have a "complaint Handler"? When were they assigned? I'd like to know please? Give me a definitive ANSWER! HELLO! IS THERE ANYBODY THERE WHO GIVES A DAMN? Account number is ************** feel free to access my account British Gas and contact me.