Rude Staff who wants to beat up customers

We had a very unpleasant experience in this gas station, the Night supervisor(Moses)was so mean and wanted to fight us. They had put a wrong price on a product that we were interested in, went to the till and the cashier was kind and apologetic until Moses the RUDE supervisor came and accused us of *****ing.and according to the customer regulations in SA it states that what the price that the customer sees the customer pays!! We were not even fighting when we made them aware of the mistake they did.Also the lady from wimpy who actually pushed me and wanted to fight us outside, telling us how she can beat us up..HORRIBLE EXPERIENCE!!!!ohh not to forget how moses wanted to refuse us of a service. He didn't want us to pay..the supervisor has not conflict management skills at all..when things get heated he wants to beat up customers..Shame on engine for appointing a supervisor who has not leadership skills..our trip was ruined by those people at engine garage