Booking.com review: refund

Whilst trying to book this hotel through Booking.com for the 14/2/2020, my booking page reverted to h the 14/11/2019, which I didn't notice. The hotel have now charged me £264 for a stay I didn't have and the hotel or Booking.com will not issue a refund.
I have tried on numerous occasions to get this resolved but I am getting shut down at every step I try to find.
I do feel this so unfair as I am being charged for something I didn't get to use.