Admin Nightmare

It has been an admin nightmare. I would score this a zero but the car I used was at least what was expected. My rental agreement was for 13 days from 7 to 20 December and we would collect and return the Car back to Cape town international Airport. I paid my invoice value and a agreed value up front for any potential expenses that might take place during the period of the rental agreement, eg. fines, extra KM driven above the agreed value of 200 per day etc. This is understandable but on the 16th of December I get an additional R1363 deducted off my account and an invoice indicating my car has been booked back in at OR tambo int Apt. This not being me, upon returning my car on the 20th i advise the Avis agent at Cape town that there has been an issue and additional funds have been deducted from my account and that the car had been booked in at OR tambo. She advises all will be sorted and Will receive my outstanding funds within 48 hours. 48 hours later still no funds received back so i query customer services. The next day I receive a notification on my phone from my back that AVIS has deducted another amount off my account equal to my initial invoice amount. Now AVIS owes me my initial deposit, and 2 additional deductions that were taken off my account. All in total R6 707,80. almost 3 times more then what i had to pay for the actual rental agreement. Still have not yet received my money.