Telkom put me on blacklist for no reason

Telkom NGN on Transunion credit report

I cancelled my Telkom account in November 2019 as I moved from ADSL to fibre. I olso paid to retain my telkomsa.net email adresses and alias and for keeping my telkom nr by tranferring it to Freshphone. I have paid all telkom invoices received from them. Now in May 2020 when I wanted to upgrade my cellphone contract I was told that I have been blacklisted by TELKOM NGN for not paying bills in Feb, Mrt, April 2020 to the ammount of R 746.00 and this relates to a complete different account number to my telkom account?? This does not make sence as I never received any invoices / bills from them in this regard?? It's unacceptable for them to do this and mess up my credit rating! I've tried emailing them and even tried using their useless online 10210. I still cannot use my telkomsa.net email address alias either. I am frustrated with Telkom's useless service. Unless I have someone contact me in 24hours I will consult my attorneys moving forwards.