jet staff member mapoya mall rude

To whom it may

how do you go about reporting a extremely rude staff member from jet mapoya mall. her name is mbaliyezizwe mrwetyana, the incident happened yesterday when a customer came to return an item, a item which cost R120 and in exchange took a item which was on sale for R45 so the customer was supposed to get R85 change, but got R40 change. a few minutes later the customer went back to jet and confronted mbaliyezwe mrwetyana that she was **********, instead of mbaliyezwe mrwetyana apologizing she performed in front of her colleagues talking back to the customer telling the customer that its not her fault its the system, the customer asked why didn't you explain to me that the item is no longer R45 but R90, she talked back keep on say to the customer "is it" "oh" "is it " "serious " when the customer was complaining that she has an attitude, the supervisor who was authorizing the purchase ended up apologizing. so please assist on the matter