Shell garage midway service is a disgrace

I was on my way to Gauteng when I decided to get to shell garage( midway) only to be served by a drunk petrol attended, who was very rude, he even said he wishes that we get involved in a car accident. We took the matter to the supervisor who seemed to have no power. He couldn't even reprimand the perpetrator. I want you to deal with that guy before he even cause more damage. We don't feel safe to even get his services while we still have to drive long distances