Telkom: attempt to collect funds irregularly from a previous client

I cancelled my Telkom landline account in November 2017 and had paid the full account owing. I recently discovered that Telkom had indicated on their system that I missed a payment of R221 in November 2018, in 2019 and the last time 31 May 2020. When I contacted Telkom they stated that the amount of R221 was an amount they owed me but I cannot claim it now and neither can I pay the amount (it was stated on my credit score that i owed them the amount). I have paid a lwyer to remove this default/missed payment from my name and I have contacted Clear score and Experian SA to assist but no luck. Can you please assist me to get this default/missed payment from my name? Thank you.