Charged for room that is not available. Not getting assisted with a refund.

I booked accommodation in ****et. I paid in full then got a confirmation. The next day they contacted me to tell me that the room is not available and they can put me in a different room and credit me 20 USD. I did not want the room they suggest so I enquired about a different room. They said that room is also no available, but it is showing as available on their site as well as other sites. I mentioned that to them and they said they would come back to me in 24 hours. ITs bees 6 day of back and forward correspondence and I still do not have a room confirmed or my money back. In the mean time the prices are going up and I need to know what's going on or get my money back before booking another place to stay. They always say they will contact their supplier and get back to me in 2 hours or 24 hours then when they get back to me they say the same thing. First and last time I ever use trip.com. Be weary not to pay in advance as you will not easily get your money back or get what you paid for.