Rude treatment at Kitkat Silverton

Most rude treatment from the guy at the exit. He treated me in the most abrupt way: when I showed him the slip of items bought, he insisted on having the credit card slip too. I couldn’t find the credit card slip immediately in my wallet (standard practice where elsewhere needed at the gate to show the slip with items, and often not even given a credit card slip anymore when paying by credit card). I showed him the sms from my bank confirming the transaction, but he shouted at me that it would not do. When I asked for a refund, he simply ignored me and instead starter to talk with a colleague. The most unhelpful, rude behaviour to a customer imaginable. I see that another customer complained about the same bad behaviour at Kitkat Silverton, but they did not even reply. Better to use other retailers that know how to treat customers.