Why sell me a phone and sim that's not working?? The R99 sim sold is not registered or maybe the phone is network locked

Yesterday I went to purchase clothes and a phone. We stood on the queue for over 30 minutes and the next thing we spend more than 30 minutes again on the counter. I spent more than 2k and I am not happy with the service delivery/ assistance regarding the cell phone.

I asked if the phone comes with the sim card and they told me No, I needed to buy a sim. I then asked for a sim they told me R1 sim cards are finished and they upsold me the R99 sim which I didn't have a problem with. The registered it for me and put it in my phone which it did not appear. The sim card is not visible, I'm using a phone without a sim card after spending so much.

The lady told me that she doesn't understand why the sim doesn't appear on this phone. I bought Itel Pro. She told me to come back today or some other time.

I don't mean to be rude but to my knowledge it looked like she is not fami**** with phones or technology. How can a customer leave the store while the phone doesn't fully function???? Most of the employees were so tired and you could tell they've been up on their feet the whole day and they were complaining about exhaustion.

Maybe that's why I couldn't get assisted. I'm so furious because it means I must go back to the store, use my money again on transport, queue the long queue again... I don't understand how can someone sell me a sim that's not working.