Treated like a *****!!!

In was treated like a ***** today when I went to my usual local petrol station to fill up. I was told that on my last visit the petrol attendant inserted the incorrect amount when putting it through on my business petrol card. I was not aware that this has happened at the time and was made to feel as if I had intentionally tried to rip them off! I do not appreciate this type of treatment and I will not be back to this petrol station.