AVIS don't refund Deposits

I rented a car from this company on the 14th January 2018, I returned the car 10 days later. Normally when you hire a car you are required to pay a deposit, which will be refunded to you when you return the car, provided there are no speeding tickets, additional accosts, etc. I paid R1400, which was debited from my wife's credit card. After returning the car, it should take maximum, 7 days to have the deposit refunded. The car was return on the 24th January 2019. To date I have not received my money. I called the customer service a couple of times enquiring about this, all I was told was that "a manual authorization was sent to the bank (Nedbank) and my money will be paid in three days. I'm tired of these empty promises. I want my money back. Upon further enquiry from family and friends, I was informed that this practice of not refunding deposits is NORMAL with AVIS. Well, I'm not gonna be part of that long list of those you don't pay back their deposits. I want my money TODAY. I'm not waiting a single day. My RA number ********** 34