Sani Car Rental - Terrible Service Refunds Department

I hired a Renault Kwid from Sani at King Shaka Airport on 5 July for 3 days and returned the vehicle in exactly the same condition on Sunday 7 July, having done minimal mileage. I also filled the tank at the petrol station at the airport as requested before returning the vehicle. To fill the tank was just over R120 in fuel. Sani took a deposit of R8 500.00 which is normal. Their conditions state that the deposit will be refunded within 3 days. As of today 13 August I have not received the refund of my deposit. Sani apologise that they have a new system and they are behind on all refunds to their customers. Customer service is even worse as they do not answer their customer service line and finally after a number of days get through to someone that says they will get their refunds department to come back to me but they never do. The only person that has tried to assist me via email is Demi Timmerman, but still no joy with my refund.