Hertz is dishonest

We filled up the car for R431 just before we returned the car, yet they charged us another R417 to fill the car. When I phoned them ( from Europe) Jono at the SANDTON CITY office promised to phone me back, which he never did. I phoned again and spoke to a lady, and she admitted that an "error" was made and that they have sent a request to the regional manager to refund me. I have asked that the regional manager phone me back, but again, so phone call. Why should I wait 5-7 working days to get my money back which they took from me in error? Secondly, there are charges by my bank in Europe for the debit and also for the credit. LASTLY, I had to make 3 phone calls to SA to try and get this resolved, at my cost!

I would like the regional manager to value me as a customer and at least return my call.