Contract ended almost a year ago and i am still been debited every month.

I have been having issues with cell c fibre to home for 9 months straight now. I cancelled their contract about beginning of last year and till now they still deducting a lot of money from my account. They deduct R2345.00 from my account every month. I have escalated the issue more than countless number of times now and all i get is a message saying someone will attend my issue then no one gets back to me. The contact person Kgosi Mokhine is the person who always tells me the issue has been resolved but it never is. This is absolutely HORRIBLE service, the worst i have ever gotten in my life!