Unjustified/Inflated Billing

I rented a car with Budget at the Cape Town Airport from 30 Oct to 02 Nov 2015. I was quoted the amount of R1309.04. Upon collection of the car, I was charged R3 278.72 and the agreement was that I was going to get a refund for the dirrerence between the quoted amount and the actual charge 4 days after return of the car. The car was returned with full tank fuel as agreed. I did not receive my refund and I called in on 09 Nov 2015 and spoke to Nonhlanhla, she said she was requesting for the money to be released. Later on the day, I received a notification from the bank that Budget yet again deducted R1 309.04 as opposed to refunding my account as requested. I called on 10 Nov 2015 and spoke to Njabulo, she said it will take 10 days for my money to be refunded and when I asked to talk to the supervisor, my request was declined. It appears to me that budget is not to be trusted as the quoted amount is not what they charge and they do not entertain customer's queries. They are just a ***** company that *****s customer's money. I am very sad, more so because my family and I ensure our private vehicles with budget, I guess it's time to move away. I am very angry.