Unpleasant shopping experience

Manager Patricia at PnP Walker Drive should be taught how to deal with customers properly. She is rude and after a mistake was found on cashier's side, neither the manager nor the cashier had the decency to apologise after I had to reason out with them how the amount payable could be R10 more than the actual goods. They kept on insisting it was right, I had to take my phone calculator and show them how it adds up. Only after many minutes of reasoning (while my hubby, baby and son waited in the car outside) did they found their mistake- the rung up one article twice instead of once. I got more attitude than anything else from the manager. If it were me and a mistake from my or my company's side I would have been apologetic and humble. Very unpleasant and I will think twice about shopping there again as I had too many bad experiences there now.