Almost 3 Months, account not sorted. Billing me

this is my second complaint. do they really care? Almost 3 months ago I requested telkom to cancel my contract because i did not want to renew it. After many attempts, still nothing. Still billing me after i requested the contract to be cancelled 13 November 2015. They called me maybe once or twice and said that it will be done. The one lady even tried to convince me to upgrade again????? why would I do that if you cant even handle my queries. WHO EVER READS THIS. PLEASE DO NOT DEAL WITH TELKOM IN ANY WAY. You might think that the products are good or cheap. BUT BELIEVE ME, THE SERVICE THAT YOU WILL EXPERIENCE IS NON EXISTENT, UNLESS YOU WANT TO PAY MONEY TO SOMEONE WHO DOES NOT CARE ABOUT YOUR NEEDS. I WILL NEVER IN MY LIFE AGAIN DEAL WITH THEM AGAIN. I know that now again they will respond and say that someone will call me or some other empty promise. I really dont know what to do about this anymore. If I reverse the debit order then it looks bad on my record that i have build up. So what must i really do?