Mtn- ******

Mtn has the worst services ever. I canceled my month-to-month contract, lady in store told me I can cancel 7 days before debit date, I did just that,3 months later they keep billing me.i go to store ,they say they can't assist me as I did it online,I phoned cancelation department and they told me it was canceled.i was billed after they told me it was cancelled. I reversed the debit orders because I can't pay for something I'm not using.i returned the device the same day I canceled ,3months ago,yet they keep billing me.im under credit review because mtn wants me to pay for services I am no longer using.