Aceparking

I made a reservation to park my car at the San Diego Airport Terminal 2 Plaza for 12 days. On their site it gave prices per day and said that if you pre-paid for the reservation you would get a discount of up to 34%. I prepaid $386. For the 12 days but it did not give me any discount at all. I sent an email asking why I hadn't received the discount which was spelled out on their site:

Why pre-pay?
Save up to 34% when you pre-pay
Take advantage of the convenience of booking in advance

This is the answer I got:
Thank you for your email. Please be aware reservation rates are dependent on an algorithm that takes into consideration when calculating the discount to provide based on the day you are parking, number of other reservations already made for the day, days of your stay, lead time notice, and time frame during the year. Due to this the discount will vary and is not offered during peak times of the year.

This information was not on the website and I think it was really misleading. I was able to find transportation for my flights and did not need parking. I cancelled the reservation. Cancellation was easy and my money was returned promptly in 2-3 days.