Technical Problem Unsolvable by *********** Customer Service

<p>All networks can phone me except for Cell C numbers. They get a voice message saying my number doesn't exist? The problem started this year. I ported from Virgin Mobile to MTN Years ago. When I call MTN no one can help me. When I visit my local MTN store, no one can help me, When I tweet MTN, no one can help me!</p> <p> </p> <p>I've called Cell C who responded by informing me that I should contact MTN's Porting Department and request an unbarring code? No such department exists that I know of?</p> <p> </p> <p>I'm very frustrated as I have a lot of friends on Cell C who just cannot contact me?</p>