Sasol attendants ****ming customers

We visited Sasol Vicks Viking to fill fuel. The petrol attendant was very chatty, talking about Valentine’s Day. When it was time to pay he asked us if we had a Sasol loyalty card. We didn’t -so he asked if he could swipe his own card. We said yes. The fuel amount was R1158. He gave us the credit card machine to pay. We then received an SMS from the bank to say that we were charged R1258. My husband asked him about this and he immediately pulled out a wad of cash and gave us R100 back., saying that he must have made a mistake. It was quite clear that he was trying to **** us, hoping we wouldn’t notice. This is not on and we will not be filling at Sasol again. I want Sasol to respond to me on email.