Telkom account from nowhere!!

I have been trying to sort this issue out for the past 7 months now and its getting really frustrating. Every time I call the call centre I am told that they don't have details of the account and someone will call me back. Which they never do. There is Telkom mobile account on my credit report that is marked as in errors and I have no idea where it comes from. It says the last payment I made was on 31 December 2020 which is complete b*llsh*t. I don't have a cell phone account, haven't had it since back in 2014 which I paid in full and closed! Please rectify this matter as it is messing with my credit score!!