Rude, intimidating cashier

I went to a Dischem Sandton City yesterday to buy my face products. The cashier Snethemba was extremely rude. She advertised the vit c tablets for me to buy, I politely told her I'm already on Vit C as I drink Zinplex daily and Vita G. She was very rude afterwards, she then said "who said thsss only have vit c there's other stuff in here and I told her my husband is a medical doctor and I'm a nurse I can't take anymore vitamin c, to prevent overdose. She wasn't happy, she was rude, she doesn't deserve to assist people who are there to shop. I was even scared to ask her if the sunscreen I was given as a free product was charged because of her rudeness and rude facial gestures she did. This is pathetic service from the store and I know nothing will be done to her. She gave me palpitations in front of my kids, what experience is that for my children. I was intimidated coming to spend my hard earned money in a shop. This is not good to make your customers scared