Do not use Booking.com car rental

I made a booking via the booking.com app for car rental on the 20 April, it said booking canceled but deducted the full amount from my bank account, I tried making another booking and they took again the full amount, and yet I got to OR Tambo and they said they cant change any details on the booking, I would need to make a new booking and they would cancel that booking due to me not having a credit card, they didn't mention that I should contact booking.com immediately as I would not receive a refund. So a new booking was made (3rd booking) and I was added as a 2nd driver and the vehicle we originally booked with the app that was gone through with the second booking was used, I am yet to receive my refunds. Woodford car rental has said they didnt receive any monies and Booking.com was contacted on 22 April and no refunds made as yet or correspondence