Received email with code to receive "Double Stamps" on stays booked before a specific date. Booked two nights on consecutive weekends at the same hotel. When I completed my stay and didn't get the afore-mentioned "Double Stamps" upon checkout, I contacted the on-line chat. Was informed that the offer only applied to "pre-paid (at the time of booking)reservations", and since I had paid at the hotel, the offer was not valid for my stay. I had kept all of the emails(for the offer as well as the two confirmation emails). NOWHERE in the terms and conditions on ANY of the emails did it mention a pre-paid reservation as a condition of the offer. On-line chat wasn't even located in the U.S., and basically read from a scripted list of responses to my inquiry. I will NEVER book through hotels.com EVER AGAIN!