DISGUSTED! Numerous issues-money deducted wrongly

2different amounts were debited wrongly&without authorisation.I had the greatest hassle proving that money was deducted(Despite sending them bank statements)I was then wrongly accused of returning my vehicle&taking1out in another province,then told I owe more money cos I didnt do a extension-I had proof of doing it&the confirmation sms.if all of that wasnt enough after rentuning my vehicle&confirming if all was ok for my deposit to be returned.I recieved confirmation that only etoll will be deducted&my deposit shall be returned in 7days.When this didnt occur I contacted branch manager who let me know Avis was in bad terms with Fnb&my deposit will be returned shortly.I recieved emails saying Avis can no longer assist me as their bank says they are no pending amounts on their side.I provided proof that the money was not in my account(confirmed with a business banker)I forwarded bank statements as well as bank emails stating that the amount was taken out but not returned.No1 can tell me when my deposit was returned&provide the proof that it was-I have provided proof that it [URL Removed] executives old me its not their problem&theres nothing they can do.Disgusted&seeking legal advice