Bad communication

On the 31first of October I went to spar at giyani to buy groceries and the treatment I got there was very shameful.I went there and everything was fine I got to the till,I found a Lady by the name of tinyiko shivhambo when I got there there was a long queue and there were two cashiers in one line the one was busy with customers and the other one had no customer at all and I then asked someone who was in the queue why there is no one there and the customer told me that that lady told her to go back because she wanted a cash back and the cashier said she doesn't have money at the till and then I went to here she didn't even greet me I had to greet her whereas she was the one who was supposed to greet me OK I asked here why don't you say next and she said to me she doesn't work on commission so she is not forced to call a customer to come to here and at that spar they don't call customers to the till and even if she can help one customer in a day she's fine with that because she doesn't get paid on commission I was so embarrassed to be told that by a cashier I mean are people trained to talk to customers that way ? OK I then asked her why are you talking to me I'm that way and she said yes I'm telling you that and to me that was wrong and she needs customer service training she doesn't treat customers in a right way the experience I got is very poor.