Tuc shop ****mers at Total garage

The tuc shop at the Total garage Hertzog street Pretoria tried for the second time to double charge me on an item which was bought by me and paid with my debit card. I was quite furious and by reminding them, the lady at the till just opened the till and gave me the over charged amount in cash. When I put it to her supervisor, her only comment was did she re inburse you? Cleary, be very carefully, they don't think twice to **** you out of money, not even an apology!! No Total garage will see me ever!