Latest experience with the service provider unsatisfactory

Having hired a polo vivo sedan through Drive South Africa on the 14th November 2019 to return it on the 17th November 2019 , I became aware of a holding deposit of fuel of R1500 on top of the holding depoist of R3000. I asked the agent why this amount as the fuel tank of the vehicle was R800 but no response was given. After much struggling I eventually took the vehicle as time was not on my side as I was driving down to Eastern Cape via N2. I was not informed of anything when I took the vehicle. When I arrived at Tsitsikama toll gate that costs R53 the boom opened and in the vehicle this was our first as we had R53 in hand. On our return the same experience happened where the boom opened without payment only to realise then the tag in windscreen. I eventually returned the vehicle on the 17th as per the contract having filled it up at a garage 800m away from the airport. I had forgotten to take my sunglasses in the center console and upon returning hardly an hour later, I was informed that the depot can't see them. A week later my money was returned more than R300 short. That got me worked up so I went to enquire only to be informed that it is R185 for toll gate that would have cost me R106 and filling up of fuel that is R135. I argued that is impossible and have been requesting the invoices since then with no luck. I was content with losing my sunglasses but to be ****** of my money was something else. I never had a challenges with Tempest Car Hire before but the latest experience is something else. Why charge a customer more than the required amount at the Tollgate? Where is the proof of fuel that they claim they filled up? I need my money as I have been promised to be communicated to via email and phone yet nothing happened. This is so not fair and reasonable cause it is me that is prejudiced by their actions in driving back and forth seeking clarity.