MTN sucks

If I could give (minus) -10 stars, it would be more appropriate. Really MTN!!! I am a customer for about 30 years now, and the last 4 months received the worst service ever. Both phones on my name have been suspended twice a month for the last 4 months, around the 17th and the 1st of every month. After reporting it everytime with lots of frustration, I get the reply that nothing is wrong on my account, and it is reconnected. Everytime before disconnection of service, I do receive a message of an outstanding account, which actually is paid up to date. Is it possible that it is MTN's account division that is not functioning at all? Is there a way to cancel my contract with MTN ? MTN sucks!!!