Arbitrary charges and no response.

On 20 July 2017 I rented a car - rental E ********** 04 - from Avis, eMalahleni. The next day I had slow puncture on one of the tyres while travelling in Kruger Park. The repair kit for the run flat tyre, which according to the car's manual, should have been in the car, was not there. I called the Avis emergency number fro assistance. They did not have a suitable car at their Skukuzu branch and requested that we arrange a temporary repair to get out of the park. I had to pay for a temporary repair to get out of the camp before nightfall. Avis Skukuza sent one of their drivers to Mbombela to fetch a suitable exchange car to our lodge just outside the park. I completed a damage report re the LF wheel. The driver arrived with the repair kit, which should have been in the car in the first place. He inspected the car and indicated on his report no further damage. He then travelled to Mbombela and back to Skukuza. I subsequently received a message billing me for two runflat tyres to the amount of R9207.20. I wrote to Nonhlanhla Masuku, arguing that the damage to the LF tyre was due to their failure to provide the repair kit as per the car's manual. Also there was no damage to another tyre as witnessed by their driver in his report. Several requests on my part to get Avis to refund the charges, met with no response.