3 days since returning the car and no refund

I hired a car from the Strand street branch on Friday, 2 October and returned it on Monday, 5 October and R5100 was blocked to my credit card. The car was cleared and all was in order and an invoice was sent for R770 which is suppose to be charged to my credit card from the money blocked. The lady at the office was really nice and said that the left over amount will be released on Monday after the car was cleared. I then contacted the call centre who said that it takes 24 - 36hrs to be released and she will send the bank a letter requesting the money to be released. I then spoke to another consultant who emailed me the invoice and she stated it takes 3 - 4 days after the letter is sent. This is really rediculous that it takes 2 minutes to put the money on hold but almost 7 days to release the same funds. All I want is the money to be released to credit card withing the next 24hrs as I need my credit card for traveling purposes. I really do not want to argue as the service on Friday was amazing but this is leaving a bad dent in the first impression.