MTN has created a sinister system to prevent contract cancellations

I have been trying to cancel a contract with MTN for over a month. The "service heros" have told me that they can't help and I should go into a store even though I have already tried that and by their own admission stores can't process cancellations. I have been told to speak to "legal" which I did. They told me to speak to "retentions" which I did many times. Each time they tell me that the only way to escalate any issues is for them to send an email to "a manager" and that someone will call me in 3-5 working days. Then a week goes past with no calls and we start this ridiculous dance again. It feels sinister and purposeful so that you can never cancel a contract. Worst service ever.