Error listing by Telkom

Hi I have an ADSL line with Telkom. I have NEVER owed Telkom but they went ahead and listed my with credit bureau for a debt of R429,01. Since 10 January 2019 I have been communicating with Telkom requesting them to rectify the error but to date they have failed. I speak to Telkom consultants daily and promises are made but to date zilch. They have acknowledged the mistake but no one wants to take responsibility of correcting the mistake. I need help. I missing out on various business opportunities as a result of Telkom error. I have shortened my interaction with Telkom but in short that is my gripe. Please help me.