no feedback whatsoever

A ********** account (Ref ***) has been opened against my name at Telkom and I am owing R1401.06 . My name is spelt incorrectly but the rest of the details is correct. I started receiving sms notifications from my bank that Nu Debt management was trying to collect money from my account. I then contacted them and they advised me that I was owing Telkom and that they have handed over my account to them. I then reversed the dr order from my bank. I was advised to send my proof of address as well as the affidavit to confirm that I am disputing this account so that the matter can be investigated. Till date nobody has contacted me, I have sent numerous emails and faxes but this is not getting sorted. I have contacted transunion and this account is affecting my credit profile negatively. I have also been receiving threatening sms from Telkom that there will be a judgment against my name but they are failing to attend to my complaint. Not sure who to contact whether its Nu Debt or Telkom as nobody is providing feedback.