MTN appalling service after 15 years as a customer

I was due for an upgrade in November 2014. As an old Nashua mobile client I had to call a number given to me to do the a upgrade since Nashua mobile is not holding MTN accounts no more. I spoke to various people at the company called 'Inter-active\ One person decided to help me after I was send from pillar to post. The upgrade and migration to the highest contract MTN can offer was logged and till this day after more than 5 months I am still in the same position as I was on the 6th November 2014. I have spend hours on the phone holding on for operators to attend to my call only to be put on hold to speak to the "right person\"". I have even tried to speak to the previous CEO Carel Pienaar and needless to say even the new CEO Farouk Ahmat doesnt take my calls. We have threatened with lawyers"