Cell C shop @Carnival Mall takes customers for granted

My old sim card is no longer readable and I bought a new sim card to sim swap. I then contact the call centre who reffered me to a cell c branch. I went to the Branch @ Carnival mall. The lady working there does not understand customer service I waitied there for about 30 minutes while she is anganging on a personal call. she then told me that they do not have sim cards and is unabled to assist me. I bought a new sim card at pepstore she insisted that they are not allowed to use sim cards bought from other stores. I could see they had sim cards on display. These stores only care for you is your are taking up a new contract. Otherwise you're just a liability. Shame on you