Listed at the ITC for Telkom's mistake!!!!

Where do I start? Please note that this is our last resort as we have tried the phoning, we tried the emails and nothing seems to work! Last year we requested someone at Telkom to come and see if we can insert a LTE line. The guy was here for 5 minutes, informed us we do not have a line in the complex and he left. Beginning of 2021 my employer picked up that I have been ITC listed - No idea what this could be.... Answer came back, it is Telkom. According to me it is not possible as I can see the debit orders go through every month.... After a huge struggle we picked up that it is the LTE line we never had!!!!! I am a debt collector for the major banks in South-Africa and I am sure you are aware that I cannot do debt collecting if my credit score is bad! So I contacted Telkom and they have sent through emails requesting a clearance letter as it was Telkom's mistake. It is now 7 months later, my employer is now requesting the letter I never received and I app**** for a home loan which I get declined for as I am listed by TELKOM WITH THE ITC! Please do help me? What do I do now? My job is on the line, my future is being ruined. I am the bread winner in the house. I cannot work if I have been ITC listed. After 7 months you tell me an investigation needs to start now.... NOW??? Do you have any signed contract from me? Have you ever come and inspected that we do not have a LTE line? I am fed up, I am so mad.... All my contracts are with Telkom, being paid monthly which amounts almost to R5000.00 for more than 9 years and this is how you treat your loyal customers? I need this removed and I need it to be done ASAP. Please get back to me.