Give me back my money!

I made a reservation before the Covid-19 pandemic and my booking had to be cancelled. The property owner responded by explaining that he is fine with my deposit of R5600 being refunded and that I needed to communicate with Booking.com directly. It's been almost 6 months and there has been no response from Booking.com. Your call lines, web and email channels have been ineffective in that its impossible to even get through. Please just give me my refund.