Disgusting service and redtape

I went to MTN Niccolway to do an upgrade after I lost my phone the previous day. The process took over an hour due to "system issues" the store was facing. After leaving I realized I didn't do a swim stop and I also decided to block my lost phone and returned to the shop. I was told the system was down and I should try the Fourways mall store. Once I arrived I had to wait over 30min to be assisted, no communication given by the people working there to the customers. When I was helped they said that the system was down but they'll try to help. I stood there for another 30 min without anyone communicating if the issue was resolved or not. The lady helping me left to go to the back and out of frustration I left and decided to call it a day. At home I called MTN call center to block my ****** phone and they couldn't assist me because the IMEI on on box of the phone didn't match the one they picked up on the system. The next day I went to Niccolway MTN and they told me the system was functioning. They tried to process my Sim swop but I was told the agent to help me on a call the previous day didn't close the "order" and it would take 24hours to resolve. I called MTN customer service to try and resolve this issue but I was told they will log a call which should be resolved after 24 hours. Now at this point I'm sitting with a new phone but without a Sim card for 2 full days. Another 24hours will be 3 days. Surely to get a new Sim card with new phone shouldn't take 3 days. Absolutely disgusted by the service MTN has and just the obstacles/redtape there is in clearing customer issues. I Absolutely regret taking out a new contract and I'm pleased to say after 2 years have lapsed, I will never be a customer ever again.