First Car Rental, Rude Customer Support Staff

The admin around renting the car was fine. The car was dropped off and picked up on time, very courteous staff, etc. My credit card was charged a deposit for fuel and etolls and upon returning the car, my credit would be refunded the balance after deducting fuel and toll charges.... Upon checking my credit card statement yesterday, an amount of R845.86 was again charged to my account. I queried this, this morning and was arrogantly told by the customer service lady that it was a refund and i should with my bank why it was the wrong way round:). I requested to speak to her supervisor, rather than continue a conversation with a "customer service" rep who had raised her voiced with me and adopted a very condescending tone. After holding on for 13 minutes odd, i ended the call. I checked my credit card statement again this morning and see that they have now credited me with -R845.86; impact zero. So now I am back where I started, awaiting my refund... Admin staff either incopetent, but most certainly rude and obnoxious.