Charged for contracts canceled 3months ago.

After canceling two contracts 3months ago, I am still being charged. Wasted money and time on numerous long phone calls and emails, still no joy. Yet, I receive up to three calls a day for the last couple of weeks from Telkom marketing dept for mobile upgrades. How do you explain that. Customer service, pathetic. Marketing dept, persistent. Still no comitment from Telkom regarding a refund, after telling them to check my itemized billing for the last two months. Each call conducted, resulted in empty promises. Still waiting to hear from Customer Care....