Customer service on cancelled service

I moved my account to prepaid more than a year ago. After confirmations by MTN that my account is on prepaid my service just got cut off a few months later. I investigated, called 135 and went into the store and they confirmed that my account was never moved to prepaid and was handed over to legal as there was no payment. MTN stopped their own debit order and did not once contact me to inform me of the amount payable. I paid the amount outstanding in order to reactivate but 3 months later still nothing. When calling 135 I get transferred to 10 different people who do not know what to do but never to legal, and then they just drop the call. I can't even cancel my account. Long story short MTN is possibly the worst customer service provider.