Rude cashier who yelled at me and **** and said systems don't work

I went to pep home in meyerton this morning and I was given such rude service from the one cashier, I was there to pay my account, purchase items under my account and pay for my phone yam account, that rude girl said to my card us faulty I can't pay for my account, she refused to help me pay for my phone yami and told me yelling that she will not serve me, the other lady then asked me to come to her till and my card miraculously worked so I could pay my account and all of a sudden phone yam was not offline, I don't know why that cashier didn't want to serve me, I will go back to the store tomorrow to get her name and surname because I felt harassed for asking for service