********** working for MTN

My account was upgraded by a staff member working for MTN but when I questioned what has happened I was told my upgrade was done through a samsumg device. From last year May they still doing an investigation. Over the time MTN has closed my network line so I can't make or receive calls. I have had to go to their offices for my line to be reopened. Now my credit record has been dented. Last year I asked to be removed from contract since I dont need them puttijng airtime every month but I was told they can't until the investigation is finished. From last year they aren't willing to help me. This really irritates because I need a new phone but I have to wait for this investigation that has been running fot over a year while my credit record is being destroyed. I dont know what to do anymore.