Deposit taking forever to be returned

I rented a car from Tempest at the Port Elizabeth Airport from the 2nd to the 4th of March. On the 15th I am still waiting for a refund on my deposit which is just not forthcoming. I called them on Monday to find out what the delay is and the operator confirmed that the payment was definitely made to my account on the 7th and that it would take 3 - 7 working days. I always do inter-bank transfers to Capitec and never has it ever taken more than 24 hours. Are we back to the cheque era? Fast forward to today, the money is still not in my account and they say it was a capturing error on their part and I have to wait another 5 working days. Dear Lord I don't have 5 more working days, the error was on their part they can't tell me they have to repeat the whole process when they have inconvenienced me so much, this needs to be fast-tracked. I need money for petrol, how am I going to travel to work next week? Please put yourselves in my position, I will not be able to work next week if I don't get my money speedily.