Bad service from Booking. com

I have been making bookings with booking. com since forever. Never had I have the atrocious service I am receiving @the moment. Made a booking on 21November 2020 for a 3day stay in Herman's for 23 to 26 December 2020.Had to cancel on 23 November 2020 due to unforeseen circumstances, now they're refusing to pay my money back & keep on referring me back to the property. The owner said Booking. com made a double booking for the same apartment, he is happy to refund, but has to come from Booking. com, now they're sending me from pillow to post. Can I just get my refund especially since they're not losing out on payment for the accommodation, which they have sold already!