Disgusting attitude and customer service

This morning I had the most terrifying experience at KFC shell garage in Century city. At 10:30 I went in to get streetwise 1. I made a portion selection and requested a thigh. I got my order and asked them to change the piece as it was not what I ordered. The lady sorting out orders at the front desk told me that I won't get what I want there's nothing special about me I won't get my thigh. I then asked what happened to portion selection option and she straight up told that they stopped and there's no more chicken. I asked them if they can give me a different portion in this instance as I didn't know about it and this lady starting speaking in isixhosa to the lady at the back to give me a small piece. I am Xhosa I could clearly hear what she was saying. She was rude and her tone of voice was disgusting. how do you raise your voice to a customer? How do you gossip about a customer Infront of them? Is the best customer service they could give? How were they even trained on handling customers? Who trained them? . Ever since this KFC changed their front staff its been downward. I work near this KFC and I know almost all the ladies at front desk but this particular one is new and has a horrible stinking attitude. She will be the reason that this franchise will receive bad ratings for customer service. First of all the chicken was dark brown either them using old oil or deep frying the chicken for long. I'm so disappointed and feel so violated this morning.