Review of AVIS RENT A CAR - HEAD OFFICE

After being a victim of South Africa's escalating crime rate, where I physically watched my car being stolen while walking towards it outside the company I work, I encountered and am still encountering challenges relating to AVIS Car hire. Fortunately, which is at the time I thought, that my insurance cover included car hire.
I was able to fetch a car from AVIS, but after having this car for a day, realised that the air conditioner was not working at all, this being the month of November where our heat ranges from 25 to 35 degrees, I returned the car , to my aggravation and was given a new car.
The above is the least of my worries.
I am at log aheads with AVIS, as the deposit that I had paid on the 30 October 2016 has still not been refunded to me. I had swiped my debit card, and the bank has confirmed that this money was definitely not reversed or refunded, I have made several calls to both the bank and AVIS and am caught up in the middle.
The bank has advised that I log a dispute that I have done, and now I am liable to the bank for R52-00 as an extra and above service fee, which is not my fault and I believe that AVIS should reimburse me with my deposit of R1350-00.
AVIS is completely and utterly disinterested at this stage, it may not seem to be a lot of money to AVIS, but this is my money and the charges and deposit should be reimbursed to me
On Friday the 13th January I was so upset and aggravated almost 2 months later, that I called the head office and spoke to Zodwa, who is an Executive PA, she agreed that this had already taken too much time and this should have been resolved long ago.She was going to get a perosn to contact me, a lady had contacted me by the name of Melissa, and said that she was looking into it for me, and these seems to be an error on their side, she will get back to me later on Friday, if not on Monday , Monday has come and gone and today is Tuesday, still nothing!!!

Is there an Ombudsman that I should escalate to?
This issue has to be resloved today, and by all means I am not threatening AVIS, but this is going to be escalated!!!!
This is unacceptable and absolute lack of customer service!!!!