Telkom SA is Good but they Have a leak /Information

So now I'm receiving some funny messages from a Company who claims I owe Telkomsa money and this company claims they will Black list me and whatever and say my mobile won't be ported and I don't have a telkom mobile How can I owe Telkomsa when I have existing account with Telkomsa I wrote to Telkomsa and complained and They immediately confirmed that they owe me money and NUDEBT is not their appointment Telkomsa must stop them now as

But NUDEBT MANAGEMENT CONTINUE TO HARASS US AND TELKOM MUST STOP THEM AS THEY CLAIM TO BE TELKOMSA APPOINTED AND YHEY CANT CONTACT US IF THEY HAVE NO DETAILS ALBEIT WRONG