Booking.com bad service

We booked and paid for our accommadation in Thailand in June last year. After a 26 hour Journey my family of 5 arrived just before midnite at the hotel only to be turned away saying our booking no longer exists as the hotel had changed ownership. There we were stranded! New years eve with most hotels fully booked. We walked the streets from one hotel to the next with all our luggage, eventually at 02:15am we managed to get a room at the holiday in , their last available room. It came at a hefty price tag as we could only get it for a minimum of 2 nights. It was double what we paid for the entire week at the "booked " hotel. i sent booking.com a mail and all i got back was "Your booking has been cancelled by the said hotel" When we returned from holiday i again mailed them to request my credit/refund and compensation for the inconvenience . Its been a week now with no reply from them. Im extremely frustrated with their lack of communication and have very little faith in booking with them in the future.