Booking.com refund ****

Bookings.com don’t pay refunds after they cancel my booking for my trip in Zanzibar 2024,it’s been over a year waiting for my refund but nothing only excuses that I get ,I’ve sent all required documents that they have requested but seemingly nothing happens,the consultant says I must change the charge on my bank statement from South African rands to dollars so I can be able to get my refund .How is that even possible ?Please don’t use this app for your booking because you will suffer .