Telkom NGN

I have been seeing missed payments on my CLEAR SCORE report for July 2020 to October 2020 for something called Telkom NGN - I have never missed a payment on any of my accounts and Telkom can't find it on their system either. I am trying to solve the matter as it reflect negatively on my credit rating. I did cancel an over the phone order and sent the parcel straight back in 2020, never received an incoice. My accounts have direct debit orders. I need it be resolved