Bad attitude from Supervisor

Las night on the 28 of September 2015 at 19:15 i filled fuel on my car at the Shell Marchadodorp, after filling up i told the attendant that i want to pay part of the bill with cash and the rest use my card. He told me it cannot be done, i told him but last week i did it.He then took me to his supervisor who confirmed that it cannot be done, i mentioned that i had done the same thing before, he said during the day they do it because the owner of the station is around but at night they don't.<br> <br> I agreed to use my card for the whole amount but told him i wasn't happy that they don't have consistency , i then advised him to put up a notice or make customers aware on how they work, what if i didn't have enough money on my card? . He then walked away from me while i was still talking to him.I followed him and asked him why is he walking away while we are still talking, he then said i am trying to tell them what to do. To me that was very rude and unprofessional especially from a supervisor.