Double billing

The waiter Michael gave me the mobile swiping machine and left and what I observed is that the was an error on the machine that's when I stood up and went to the cashier by the door to assist and then the lady called the manager Thato who said that there is an error which means I have to swipe the card again and I showed him the SMS from my phone that stated that the money went through but he insisted I swipe again and the money will be reversed from my bank.he even gave me his cellphone number and telling me if is not reversed I must call him,I did call him and all he said to me is that I must bring my bank statement .i wonder if spur doesn't have their bank statement to see that they have billed me twice,I can't go to the bank to get a bank statement for this as already I have double charges on the transactions they did.all I want is my money .its been two weeks now because this happened on the 25/07/2015