Bad Service at King Williams Town Shoprite

Today went to do shopping in King Williams Town Shoprite and I got a bad service. The cashier by the name Amanda was very rude. I was using my shoprite stamps which I collected during the year she said I'm paying with stamps because I don't have money, I depend on social grant. I ask her nicely to do her job than being rude, she told she is working for shoprite and she is beautiful unlike me who is getting money from Sassa. I told her I'll call the manager and she doesn't care I can call the manager she is not scared of her and I called the manager. What worries me is that most of King Williams Town Shoprite customers are old people who are paying grant and it might happen that Amanda keeps on reminding them about their social grant.