Difficulty with deposit money

I rented a car at Hertz (Cape Town Airport) on the 26th of June 2019 at about 01H00. An amount of about R7650 was retained as a deposit, with an assurance that it will be returned when the car is returned all in order and with a full tank of petrol. I returned the car on the 1st of July at about 19H30, about three(3) hours earlier than the time agreed on. I recieved an invoice with zero balance, invoice number ***2-1 confirming that the car was all okay. To this date I am still waiting for my money back. I have been calling Hertz and the answer I get is that they will send an authorization to their bank (standard bank) who in turn will contact my bank (nedbank) to tell them to release my money.

To this day I have been back and forth between nedbank and Hertz trying to get my money back. Nedbank says they waiting on authorization so I must contact Hertz, Hertz says I must contact Nedbank. . . .back and forth and forth and so on and so on. I have run out of money to buy airtime to make those calls, please help. Asanda Lugalo. Customer number Z1KJ8L