Listed on the credit bureau for a landline I do not even have!

My previous contract cancellation issue was resolve, now I have on my credit report an outstanding amount of R610.00 for a landline I do not even have. Disputed this on the 12th of June 2018 on my Telkom Online profile but nothing was resolved. I called a week ago and they told me it's "*****".. don't know from who's end but I decided to comply and send through an affidavit stating my dispute. I still do not have any answers or even a follow up call.. FIX THIS TELKOM! I am spending endless amounts of monies trying to resolve this and you will pay every single cent.