Tygervalley Pick'n Pay

I went into the Pick n Pay store in Tygervalley and needed authorisation because the items I bought was not scanning the promo price. The staff member at the tills asked me to call the supervisor named Wendy because we were waiting for 12 minutes for her to come and assist. When I went to her she shouted at me in front of all the other customers and staff, telling me she is not the only one working and she's bus so I should call other supervisors and she doesn't work for me among other things. Im so disgusted and disappointed that this behaviour and treatment of customers is allowed.