Horrible customer service

Yesterday I went to pep store clearwater mall to exchange clothes for my kids as they were small. I got to the queue and the lady that was helping other cus just left her till and went at the back leaving us queing there with no explanation or anything. Finally I was assisted by a lady called Kamogelo, I dont even remember if she greeted me or not. I told her what I needed to do and she did what she was suppose to do and then she told me that I needed to pay R10 extra I was shocked as to why I needed to pay because I was exchanging exactly the same clothes anyway I didn't ask because clearly she was not going to tell me why I needed to pay. Unfortunately I didn't have any cash with me or my card as they were all in the car, I asked her to help someone else while I quickly go to the car and come back. She gave me a very irritated look and called her manager "void" as I was going out she rudely called me "tsayang dilo tsa lona" as in come take your things. I was very disturbed by her behavior but I kept quite and went to the car without going back to take the clothes. When I came back, she made me queue again then she took my things and gave them to the next cashier as a sign that she is not going to assist me again. I asked for the manager and asked for the complaint department's number and he called them out for me which was not professional at all. I had to tell him to write them down with his name and the cashier's name. He rudely asked why I wanted his name and I told him because I want to complain about the service I received. He wasn't interested in finding out what happened or how he can assist instead he gave me the number and left as if nothing happened. I am very disturbed about this kind of treatment because I have been a loyal customer of pep store Clearwater since it opened. Can you please train your staff on customer service and how to treat customers and the manager should be the face of the store and not look confused as he did. I work with customers everyday that's why I always expect good customer service because I know how to give good service