Same thing happened to me this week at Utell for AMS. And boy are they giving me a hard time about it. Not that I expected to get a room for ZERO but they have no sense of honoring a rate. I have been told that confirmation is just letting me know I have a reservation NOT a guarantee of the rate. Now what if we were not talking about a $0.00 rate but maybe my confirmation states $100 and I check-in and they tell me $200. They are not required to honor the $100 rate? Does not seem right to me.