Booking.com complaint: Booked an incorrect venue of the same name in Thailand refused a refund

I was staying in Pattaya Thailand and booked accomodation at Siam Siam but incorrectly booked Bangkok instead of in pattaya. They have properties in both locations. Booking.com accepted the first booking and when contacted refused to refund the incorrect booking. I then booked directly through the Pattaya property for 3 rooms. Siam Siam Bangkok were contacted and agreeed to refund the accomodation but due to us not attending they were not paid. They contacted the 3rd party booking agent who agreed to refund the monies once they received them. I contacted Booking.com with the information, they refused to refund again due to a 3rd party. All parties agreed that the money approx $600 Aus $ except booking .com who refused. Eventually theyb just stopped contact. I am not sure who got paid but it was taken from my credit card and the parties who were supposed to be the ones refusing the refund agreed stating they had not been paid.