Avis Budget Harassment and ugly customer service

I had a lease contract on a group B car from March to July with Avis Budget Randburg .On the month of July Avis said they need to deduct R18 500 and I deposited R19 000 into my designated account then they deducted and an amount of +R4000 remained in the account. A few days later a lady in Randburg Portia said I should pay R13 300 and I deposited R10 000 and the balance in the account was all deducted. In the process I made an enquiry with ********** and asked for a detailed statement from the beginning of my contract. She demanded that I deposit more money. I went to the bank and sent my bank statements and I called her to talk to her about the account. A few minutes later I was called by Shaun from tracker asking me for my location so he can come pick up the Avis car. I told Shaun that I just got off the phone with Feroza and she did not even mention that I should return the car. I told Shaun that I am not a ***** and I will take the car to Rustenburg branch where they gave it to me, which I did the next morning. What infuriated me the most is Feroza sends tracker to pick up the car after two deductions from my account and without even communicating return of the car despite being on the phone with me a few minutes earlier. Rustenburg branch said they can't close the contract it needed R6 000 rand and yet Feroza had sent tracker for pick up. I had to return the car 15 days before expiry of my monthly contract which means now Avis Budget is making money with the same car for the remainder of the month since I am not giving into their demands of a bottomless pit of money. Just how many times in a month does Avis Budget expects to collect money from one contract it beats me. I would advise everyone to think carefully before considering a lease with Avis Budget.