Electricity Cashier Bad Attitude

Went to buy electricity and not being aware of the note, I made a mistake selecting an incorrect transaction it was around 10:05am. I then asked for help and Goitsemang came after looking around for him for minutes, with an attitude and his colleague sitting inside cash machines stating that I must go complain at Midrand. Issue here is that their note is not visible and for first time users it is difficult, they both claim that they are there only for senior citizens but even though there was a granny who struggled while they were both absent. How can this be raised? Thanks