AVIS Lanseria doesn't care... is deducting money from my account without my permission *****?

I visited Lanseria Airport 4 times to try and resolve as couldn't get through on the phone... used the online contact service to escalate to executive directors.... no one cares at Avis... 2 issues not resolved since February 9th until now... R4,000 deducted in error from my account not refunded and R1,800 refund for overcharge for an extra day's hire due to unclear rules about time car had to be returned and extra 200 km allowance due to car unfit to drive due to a known manufacture's defect causing us to drive a round trip of 220km to get the car replaced... uncertain when we will get our money!!!