don't give them a REFUNDABLE DEPOSIT

I paid a R5000 REFUNDABLE reservation deposit. 2 days later, wehn I decided I'm not purchasing the vehicle, they are giving me trouble to refund me. They seemingly are NOT able to refund on the same credit card which I used for payment. To me, that has got nothing to do with can or can't but management policy for some reason. I then provided a cheque account number, proof of banking details. Then they request a copy of my ID as well. I have been a victim of identity theft, so I'm extremely cautious to provide such information. I provided them with pic of my ID which I duly painted and wrote the letters 'COPY' on it. They now say this is not acceptable!!! Are they trying to ***** my money?