Misleading and vindictive service

So I hired a vehicle from Avis because my vehicle went in for repairs and my insurance referred me to Avis. When I received the 1st car hire vehicle, it was raining so we could not do that check fully. It was smelling of a food odour and there was hard mud all over the pedals and carpets and inside of the back and front doors. I requested to change it to which they eventually did because that smell was not going away. Hired a 2nd vehicle. When I dropped off the vehicle after my car was ready, Avis had the nerve to say that my insurance company Momentum don't cover for 30days and that's how they rob people. So vindictive and nasty. I then called my insurance and they eventually had to email Avis to let them know that my insurance covers for 30days and to reimburse me. Avis does not have the decency to ever call to sort this out. I paid R1500(holding fee) and then R3250(usage fee csuse they said I was not covered for 8days more which was false). From the R4750, I have only received R2319.96. No matter how many times I ask, they just do not care. They sent me an invoice yet when I query, no one seems to answer the question of Where's the rest of my money. Eventually someone did say wait a few more days after that R2319.96 I received because the bank is probably holding it to clear. Is that what Avis does?!?! Always passes the buck and never wanting to help? For such a reputable company to do and say such is pathetic. Their service delivery has gone down the gutters. Even that 1st vehicle, which rental agency gives customers a hired vehicle in such a terrible state and no care attitude.