Incorrect Billing & Severe Lack Of Service

I contacted Lizette Smith from the Telkom Menlyn branch, Pretoria to cancel my Telkom account in October 2014. According to the contract, I need to give 30 days notice, therefore payment for November is only necessary. Telkom then wrongly billed me for the months following November.<br> I tried to settle this with Telkom to no avail. I decided to settle the outstanding amount last year. I then found out that I have been blacklisted, even though my account was now paid in full. I have the proof of payment and Telkom invoice showing that my account is settled. Now I have a bad credit rating and is unable to apply for any loans, credit cards, etc. I am enraged about this, because all my account are always paid in full by the required dates. I urgently need a PAID UP LETTER from Telkom to settle this dispute, but I am having no success with any of the Telkom operators. Please, Telkom, send me the letter!!!