Overcharging customers with 10c when refilling petrol.

So not to be Petty, But I went to Sasol to put R200.00 in my car not R200.10 or R200.90, R200.00 When it came to paying I see additional 10c charged. He wanted me to pay for that. I'm sorry I know 10c is nothing but as I drove past the other petrol pumps I saw everyone one of them had charged a additional 10c. Its *********