Unresolved mtn account for 5 months

I would like someone from MTN to sort this out. It's been going on 5 months now and my account has still not been sorted out with MTN. My contract came to an end in March and I notified MTN to cancel my contract. 2 months later I got a bill for an account I have already canceled n went on prepaid. MTN referred my account the legal and through legal I notified them of the situation n they send MTN credit department to pass a credit not on my account. To this day MTN did not credit my account and I'm stl having to call and been pushed from a call centee to credit department to retention to cancelations. Everyday I call but get no where as no one can help me and come 6 th July mtn will again suspend my account for no reason Please can someone assist with sorting this issue out for me once and for all. I have sent call logs n emails but no one assists me to this day. Sharlene Naidoo ***