Bad bad customer service

I had an awful awful experience with this one shop the cashier there was so rude, she told me i must pack for myself an i asked why should i pack for myself, she said because I'm busy,there was only 2 people behind me, so i said no she must pack for me an then she said she won't because in shoprite when they don't pack for us we don't complain. I was very disappointed. Another girl who was standing by the other till said to me don't worry ma I'll pack for u.I just think that they they have to teach their staff Respect ,Customer service by the way is in the South of Johannesburg