Attendant mocking me over a failed swipe attempt

At 12.40hrs on 23 Feb 2016, I requested for R100 petrol and was attended by a guy named as per name tag and on receipt. The first attempt to swipe failed, \Authorisation attempt failed\". I asked them to try again as I am pretty sure the account has money but the cashier on duty along side with Jacob refuses and rather mocks me over my card saying there is no money in the card. I insisted they try again and they refused and even went on making some mockery remarks of my card. This did not go well with me till I requested to have the manager to assist because I think it was rude to mock me over my card when I know there's money. I only tried after the manager came whom I did not quote his name but still one of the attendants confirmed they have bad network on their swiping machines. I then withdrew from an absa atm at the garage using my fnb card which obviously costs more. I feel I was mistreated as a customer because they know their network problem and instead of explaining to me they make a joke a out of my account."