MTN service ? No go

On my MTN account I have 2 devices one is an MTN Sh@relink (I use it) the other was a Sony phone (no longer have it contract is over too) in November of 2015 I made a report to hellopeter because my line was blocked ... It was hard to figure out why because I never get bills from mtn since they decided to stop sending them . It turns out the phone was to blame ... Eventually after a long struggle with mtn as they without any warning sent my account to the legal team I was told I had a bill ... I payed it and sent proof but it took more effort from my side and 2 weeks for them to reconnect my account ... I was finally told that the Sony Device was removed (It was November 2015) we'll now my account is not working and why you might ask ? Because they never unlinked the device from the account ... I have been paying months for nothing .. So this is my proposal , I will not pay a single cent to you and you will deduct the amount which I had payed since November 2015 till now from my account ... The Sony phone is to be removed ... And the account is to be reconnected then following that I will pay for the Sh@relink device as needed . Good Day