Cashiers and managers act like customers don't exist

I tried to buy a few items from Pick n Pay earlier. The cashier was chatting to her colleagues. When I tried to pay, it seemed there was a problem with my card. The cashier kept swiping my card and the manager also came - they proceeded talking to each other and not me, so I left. Now I have been charged for the items I didn't take with me because their card machine did not work. If they had taken a second to speak to me, I would have told them that they could cover the card with paper - this sometimes helps the machine read the chip. But I could never have told them this, because they barely acknowledged my presence. I will never shop at this Pick n Pay again, you can keep your broken card machines and your bad attitudes.