Hotels.com — Irresponsibility of hotels.com about a lousy hotel

I reserved a room in a hotel in İstanbul for a night and paid but after a while the hotel called me and said that they don't have availability, although it seemed vacant in hotels.com... So I tried to cancel my booking but couldn't succeed. I wrote to hotels.com and informed them about the situation. They seemed to do something but at the end they wrote to me that they could do nothing about this... Such an irresponsibility is not something that I can accept.. they got the money and in order to not to refund, they collaborated with the lousy hotel... I would highly recommend to anybody to think twice before working with hotels.com... :(