MTN unable to solve problems

I upgraded my contract on 01/08/20. Since the upgrade all my incoming calls show unknown. After numerous calls and phone settings , I was told it was a setting from MTN side that needed to be logged and it would take 2 to 72 hours to be rectified. Well its a week later now and still nothing. It doesn't even help phoning because nobody knows whats going on. I was also told I would receive 20 gigs once off with my upgrade and also nothing.