Cannot cancel a month to month contract what a **** !!!!

I have cancelled my contract after numerous calls and finally an email, I then when through the pain staking task of contacting again to verify if it has been cancelled and was confirmed, it is now 2 months later and my bank advised that I am in areas with cell c for two months , this is unacceptable now my credit is affected I want this to be sorted out ASAP and my name to be cleared