Heartgard

Bought the 12 months of Heartgard and provided the offer of a rebate. Jumped through their hoops. Received a VISA gift card... that does not work. I went on the 'activate' site - and it tells me the card is invalid.
Word of warning people - if you're looking for a rebate from these scam artists - it is complete DOG POOP.
Here's a copy of one of the ads:
"Get $12 back
Enjoy a $12 rebate when you buy 12 doses of HEARTGARD® Plus (ivermectin/pyrantel): Simply download the coupon and take it to your vet.*
DOWNLOAD COUPON
*You'll receive your money-back rebate in the mail"
There are other/similar vendors out there. USE THEM - don't continue to give these guys any business. Liars and thieves. Would love to sic my dog on them!