Fabricated Telkom account and Billing

I have an issue with Telkom since 2016 that they still can not resolve. Telkom registered an account for my business and billed me for it, but this never excised. I never received any billing from them, paperwork or email, there are no Telkom infrastructure at all at my business and yet there is apparently an amount outstanding. I have asked them to send me the accompanying paperwork that I would have had to fill in or sign for this account to be possible but they do not have any....... I have even mailed them my VOIP accounts since 2015 so that they can see I would not have had the need for Telkom services as this is a 5 year contract..... The R300 odd that somehow is outstanding has now escalated to R900 odd as there are interest and lawyer costs added to the amount. So even after all my efforts and requests to resolve this they have handed this over to lawyers!!!! How ridiculous is this!!!! I do not even have an account reverence for this Telkom issue, all I have is a reference from the lawyers that handles this for Telkom DC Fourie INC (NT310445). My question is what are my options to resolve this if after all my communications they can still not manage. What are my options if my business gets a bad credit report because of this, as once the damage is done it is done...?