Extremely poor customer service

I have been an MTN customer for 16+ years. I have had a contract with MTN for the same number of years where i have upgraded as I was permitted. I went to the branch at Glen shopping center to upgrade. They told me that they could not upgrade me as I was on the old system. They can not offer me any of the new appealing packages until I am migrated onto the new system. To upgrade me on a new package would cost R299 whereas the old package would be R599. She explained that MTN is busy migrating their customers in batches. I laid a complained which she logged and told me she would call me and give me feedback. She could not give me a reference number even. To date nothing! I am now out of contract and went to Mall of the South MTN to upgrade and was told i cant upgrade. Her explanation is, my account is on the old system so even if i cancel my contract and reapply i will still be on their old system and will not qualify for the new deals. This is absolute ******* to say the least. Why am I being penalized as a customer because MTN cannot figure its systems out! I AM NO LONGER IN CONTRACT! WHO GIVES YOU THE RIGHT TO TAKE AWAY MY FREEDOM OF CHOICE. YOU ARE CONTRAVENING THE CONSUMER PROTECTION ACT AND THE NATIONAL CREDIT ACT! Consumer protection is the practice of safeguarding buyers of goods and services, and the public, against unfair practices in the marketplace. MTN is treating me unfairly. As for the NCA i am out of contract with MTN but they are stopping me from renewing my contract based on their systems limitations. I WANT TO BE MIGRATED TO THE NEW SYSTEM IMMEDIATELY!!!