Harassed By Agents for a CLOSED TELKOM Acc

I have been harassed by this customer contact centre that is doing collections for Telkom every 5 minutes, everyday. I had a Telkom account over 6 years ago which I settled and closed but get harassed by these agents every ****** day which is highly annoying. When I receive Telkom statements, it says 0.00, I have been using Neotel for over 2 years now, so I do not know why I am getting calls now after 6 years to tell me about an account I closed so many years ago. The contact centre number is ***/ ***, please tell them to stop harassing me or they must send me the statements that I have been requesting since last year showing me where I am owing them as they saying. This is ****** annoying me to bits that I will take further to the ombudsman because I do not have peace at all, then on top of that they will be sending statements telling me I owe them for the harassing calls they sending me. I was handed over to MMM in which I settled this account and now someone else buys the debt and wants to set me back even more and tell me I owe millions when in fact I owe nothing!!! Please investigate this as its getting very irritating getting these calls.