Deposit refund

I did rent a car on February 15th for one day and return it back the next day without any problems or damages. I paid all the fees with the deposit but after I return the car they haven’t given me back my deposit of R3000. I called them several times and we had some mail exchanges as proof. It has been 4 months now I haven’t received any refund. Pss car rental did steal my money and they don’t want to give it back. They are just liars and thieves