Rude cashier refusing to apologize

I was at PNP in Ivory Tembisa, stood on a long que for about 5mints, when it was my turn a till packer from the same store decided to purchase airtime without even asking me or the people on the que, they started chatting for about 2mints before I could be assisted, I raised my concern with Thandi *cashier, whom just rudely looked at me and decided to carry on helping other customers. I than requested the manager, to who Thandi still bluntly refused to apologize, while the till packer apologized and admitted what they did was wrong! Is this how you treat your customers