Funds not paid back within 7 working days

Rented a car on 22 September and returned it on 27 September. When I made the reservation telephonically and we were told that the money that they would reserve would be R1700 and when we picked up the car it changed to R1900. We asked upon collection and return of the car how long it would take for the funds to be released and we were told 7 working days after the car was returned. We called on Tuesday the 29th to ensure that our account had been closed and it hadn't. The guy told us he manually closed it and it would take 7 days from that date. On 6 October I called again and was told that it would take 24 hours. On 7 October I called AGAIN and was told that because I used a cheque card it takes longer than 7 days to release the funds. (WE WERE NOT NOTIFIED OF THIS WHEN WE COLLECTED THE CAR EVEN THOUGH THE PERSON HELPING US SAW THE CARD WE WERE USING!) Now I'm being told 3-4 working days from the 7th of October. It has been 10 days since the car was returned. I AM NOT IMPRESSED!