Overcharged

I rented a car from Walvis Bay Avis for the period 17 Dec to 21 Dec 2015. The problems I have with this transaction are as follows:<br> <br> - I was charged significantly more for the theft waiver, and the windscreen/tyre waiver than what the Avis consultant said when I picked up the vehicle.<br> - The invoice took incredibly long to generate (not the 48 hours).<br> - I refuelled the vehicle prior to returning it. On the invoice there is an additional charge for refuelling. It would have been physically impossible to refuel the vehicle after I returned it full.<br> - The amount charged to my card is more than what is in the invoice.<br> <br> These charges and the way they are being handled is borderline ******** and unacceptable. The consultant, Brian Mbele, has not gotten back to me.<br> <br> I feel that I returned the car safely to Avis, thereby upholding my side of the deal. In turn Avis has used this transaction as an oppurtunity to swindle me.