MTN Festival Mall a useless branch. don't use them or helped by ladies

I was using the old simcard for years. i just bought the new phone A34. now i went to MTN Festival Mall to do the sim swap. now i can't even get whatsapp message to verify my account. i even put the sim on another phone but no luck. Those ladies don't customers with respect and dont want to listen to you. Now i can't see important whatsapp messages. It is best to switch to Vodacom