Booking.com ************ in the making

They have both refunded me R31 500 from my booking on the 15th December 2021. I had to pay owner of holiday home when we booked out due to Booking.com not paying them on previous booking. They stated they were refunding me which would take 7 to 12 working days which firstly, I stated I was not happy about. Thereafter I have been following up almost everyday and now they stating I must contact my bank as they submitted the refund. They will not provide me with proof of payment and state they cannot do so and keep on stating I should contact my bank. I have been debited interest on my credit card and there is not easy way of contacting them. When I do call they keep cutting the calls. I am at the point of charging them for theft as I would not refer them to my worst enemy. Please note I made payment to them on the 28th November 2021