Pathetic Service

I purchased items worth R271.00 and the teller who assisted scan all my items, asked for my card (account), everything was done and I signed for the transaction, while waiting for the receipt, her system shut down and she said she need to re-do the transaction, she confirmed to me that it was never successful and she needs it redone. we started all over and another transaction was successfully done. later in the month i received my statement and 2 same transaction were taken off, same amount and date, I visited the same store to complain/ask for a refund, I was told by the so -called manager to come with my statement to prove the transaction. i am disapointed that i had to travel and then he had the decency to ask me to return again. Obviously all the transaction and history on my account (especially recent transaction) should reflect on their system too. I am highly disappointed and cant wait to close my account and never set foot in that store again.