Irene Mall Pick n Pay

I had bad service with Pick n Pay Irene Mall #1. The cashier wasn't friendly #2. She charged me 3 x item instead of 2, only realised this when I arrive home checking the till slip. I think she intentionally just put the slip inside the bag knowing that she has made a mistake. So I will be waiting for her Manager to respond. Tried calling them without luck, Sent DM on X but nothing. That's how consumers are treated.