Telkom Accounts Staff incompetence and malicious actions!!

Don't know why we bother as screening the first page it is clear this Business does NOT reply to any of these reviews or rather complaints. For 4 years we used Telkom ADSL and they were an excellent service provider and any issues I had was resolved almost immediately. I even got discounted for the time the line was not available. However - the ACCOUNTS DEPARTMENT is a different story. Those *********** staff hide behind the wall called Call Centre. 2 - yes two years ago, I moved to a different area and requested the line to be moved to the new property. Telkom technical advised me there is no service available where I am going and the services will be cancelled. All good so far. We kept on receiving accounts. About 9 months later a lady phoned me and I explained the situation. I was assured all outstanding amounts will be reversed and the account closed. Mmmmm - no - this did not happen. I had another discussion with them a couple of months later and no, it still did not happen. Then some bright spark decided to black list me!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! I sat on the phone literally for hours in December demanding the reversal thereof and a letter of apology and was reassured that I will receive the letter in 10 days. On the 17 Jan this year I again spent a huge amount of time to eventually speak to someone - after demanding to speak to a supervisor as you hit this brick wall at the Call Centre. The Call Center offered to log a new request - really?!?!?!?!? This supervisor lady acknowledge the issue and (again) reassured me it will be sorted by the Accounts Department. No-one however is willing to provide a telephone number for the Accounts Department and I was given the email of this Supervisor to follow up. Great help that is because another month later and an email each week over the past 2 weeks and the same behavior as Escom - darkness! No reply and no letter. Now I am blacklisted and the person responsible is not owning up and the company is not rectifying their *********** staff's actions. Wouldn't it be great if you can blacklist a person in error when they blacklist you in error - see how they enjoy the time, expense, embarrassment, financial loss (when you are looking for a job) and frustration because of their incompetence!!!! What is my next step now? Where do I turn? Is Telkom a member of a financial institution where we can get assistance or maybe an ombudsman or a consumer assistance institution?