Unauthorised Transaction

on the 18 December I rented a car with Avis Centurion. The returned date was set to be the 11 January 2016 but it did not go as planned due to unforeseen circumstances. The car was finally returned to Grand Central airport yesterday (Wednesday) due to delays caused them by debiting my bank account without communicating with me. They took R3662.47 on top of R9000.00 that was taken on the 18 December 2015. When I called them to inquire about the transaction I was told by Nichole the branch manager that they had to do that because I have extended days of rental. Without denying the charges of rental extension they recoup a very huge amount of money which led to an unauthorized overdraft on my side hence I did not expect them to take so much money yet there is a deposit of R3900 that is still with them. I called Nichole explaining that while I was busy buying my daughters stationary and other school staff I was told that there is insufficient money in my card to pay for my purchases,she then promised to reverse the transaction immediately which is still not done up to now. I need transaction to be reversed now.