MTN CELLOPHONE NETWORK PROBLEM

I bought a Huawei P40 Iife July 2020. For more than 10 years I was using prepaid and when I bought the P40 I moved to contract. Since then I was having problems with making outgoing calls and it took me a month to be able to make calls. Evently i got assistance in August 2020.

On the 6th of November 2020 again the same thing happened, the whole weekend I was unable to make calls, I went to Vincent Park MTN on the 9th November and I was advised by the store manager to buy a new Sim card and I bought the Sim card. It took her 3 hours to activate my phone and for me to make outgoing calls. The next thing I was unable to see the callers name when receiving a call. Until today the 22nd November my phone has not been fixed. I have been phoning MTN consultants seeking For assistance all of them told me that it's the network problem. The last person from MTN the consultant promised me that last week Friday the 20th November my phone was going to be fixed after 2 hours and I checked again at 2h30 still the same My worry is that I don't know who is calling me and also when there is a missed call I don't know who called me.