Booking - Fraudulent charge Internet

Booking.com Baymont Inn, Ardmore OK Booked a hotel online thru booking.com, checked box to pay on arrival, got to hotel and they changed the price from advertised price. I arrived prior to required check in time. I told them I wouldn't stay if they would not honor the online price.They told me "too bad" they charged my card when I made the booking online. I told clerk to refund my card and they refused. I disputed the charge with Discover card and eventually the charge was reinstated because the Baymont Inn told them I never showed up at the hotel. I then tried to dispute the charge thru booking .com but they asked for a confirmation number which expired on my text. Then they ignored me and I recieved nothing more from booking.com