Over charging in a fix contract

I have been trying since Feb to sort out my account. After MTN has taken huge amounts out of my bank account I stopped payment and started paying the agreed contract fee<br> This they didnt like and blocked my no<br> <br> Not only have I send hundreds of mails and SMS begging for assistance. Up to date they refer me to the Legal department. When I call the Legal department they require a phone no to be put in on the system as the no has been blocked the no is invalid. It seems that not a single person at MTN can be reach if you dont have valid no <br> I have begged them to assist me but it seems nobody at MTN is interested in there clients<br> This is sad as they have lost a client for life.