Will NEVER again do business with Budget-Avis

Rented a car from Oct28th to Nov11th in Johannesburg South Africa. At the counter, they were not pleased with the price already paid with "Easyrentcars". I had to pay for a second driver and an authorisation to cross border travel. They changed averythong in the contract, trying to make me pay more than the fees for these to addons. Finally, the final contract was to be R1004 more. They charged me R2275 on my card on the same day and I saw it when I received my account during december. They don't answer to my demands for a refund. A SCAM !!??