Telkom Cancellation and Billing

I had an ADSL line with Telkom that I cancelled using the correct methods After struggling to get it cancelled they still wanted me to pay for the subscription that was not in use a month before cancellation after re sending the forms and escalations they cleared my account and years later when I went to get a home lone on the 28th of Jan 2019 my credit report still reflects that I am listed on ITC for a few hundred rand for Telkom but when calling Telkom they said my account is up to date and I don't owe them anything but they can only send an email to clear that which should have been done years ago.