Cancellation of account still not processed after months

I cancelled my account in June, and provided all documentation. I am still receiving bills and I am still on the system as being an active customer (telephone and ADSL). This is unacceptable. I have phoned 3 times, sent proof of cancellation to 4 different people and still the problem continues. My 'bill' is now over R3000 (not including the 30 days I paid as a cancellation fee) for a service I am not using. Previous call confirmed my case had been 'escalated'. No change to the situation. This outstanding balance must be erased and my cancellation finalised once and for all! This administrative incompetence is unacceptable. Account number: ********** 52323