Cannot fix problem created by MTN

After being with MTN for at least 15 years, if not more, on a open contract. They decided to change my contract to TOP UP, however, the contract on the MTN system says its an open contract. If it was open, I would be able make calls. Currently when trying to make calls, it asks for a top up. After not having a phone for 4 days, I tried doing a top up and it didn't work. I cannot conduct any business and it is frustrating that every person I speak to a MTN at customer care (808) or at an actual branch, doesn't know what's wrong and cannot fix the problem. How can some not take control and fix it, or try fix it. Cannot get hold of management who will try solve this problem as customer service cannot put me through to a manager. The two branches I went to, couldn't help me either. Called 808 at least 8 times now.<br> Please can someone call me and try fix the problem. What can I do? Can anyone with a brain at MTN please call me and try solve this problem.