Ackermans customer service must improve

I went to buy hair extensions and hair food. When I get to the till I notice that the price to be paid for the item is different from the price tag on the hairpiece. I ask why and the cashier Sphetho rudely says what am I talking about, I show her the items and she calls managers they explain to me how the mix up came about. I then ask to return the items and the cashier shouts at me and keeps mumbling behind her mask as she yells 'void' to her manager. I calmly ask her what's wrong because I cannot afford to exceed what I planned to spend. I get that everyone is frustrated, impatient and going through things but we have to respect one another. I really don't appreciate being shouted at especially infront of my child.