Frustrated MTN customer

I took a contract with MTN last year and did a sim swap from Vodacom to MTN as I didn't want to lose my number. I was told everything is okay but little did I know that, this was the beginning of my problem. I realised that when I am being called on a landline my number does not get through, I tried calling myself from my work number but the call did not get through. I contacted the MTN contact center several times to report the same issue over and over again, but nothing was done. I went to one of the stores, but still a case was logged but still nothing has been done. I was told I must contact Vodacom to close the number from their network but vodacom advised that this was done and MTN must sort out the issue. I have ran out of options and left frustrated. My number now appears as a private number and I really don't know why was that done. Can someone from the head office get back to me with a resolution urgently.