Filling station makes card imprints

I filled up at Sasol Dalpark this morning. When I handed my card to the attendant, he moved to the back of my car. I noticed him scratching an imprint of my card on a paper. I confronted him, he handed it over. I called the office to be told it is standard practice. The manager told me she was there 24/7 and nothing untoward ever happens. I said I was not comfortable with the practice. She persisted. I said in that case I would not use the filling station again, upon which she put the phone down in mid conversation. Naughty Sasol Dalpark? We have a fleet of vehicles. This is a NO NO in my world!!!