Pathetic abusive company

Iam here yet again with my unresolved issue with MTN not cancelling my contract that’s over 24 months. Yet again another month end is coming they expecting a payment from me. Since the 28 April been going back and forth but no luck. Last week was chatting on twitter with ZLN and promised feedback by Tuesday the 19th May but nothing. Is going through the ombudsman the only way we get help with mtn, if I’m not double debited then billed for services I asked nicely to be canceled