Telkom NGN account wrongly accredited to me

I have just learned that my credit record has been badly affected by an unpaid Telkom NGN account. I used to have a ADSL account at a previous address which was cancelled when i moved to Telkom LTE. Years went by and a few months ago an outstanding amount popped up On my telkom app on an account i did not have knowledge of. I freaked out and spend a whole morning on the phone to Telkom only to figure out that after i cancelled my adsl and no charges for months, som charges were started again against this account. The gentleman that helped me that morning assured me it will be reversed and it disappeared from my Telkom app. Applying for a home loan now it came to light that i owe R104 long outstanding to Telkom NGN?????? One bank refused me a loan because of this!!!