Telkom Account Handed Over

My Telkom Fixed Landline account was handed over for an outstanding amount due to agencies which reflected on my credit rating. I closed my fixed landline account a few months ago and received communication from Telkom that the cancellation was complete with no reference to an outstanding amount. I only received notice of the outstanding balance from a third party who performed a credit check on me for an application. I was however not contacted by Telkom once before my account was apparently handed over. I was also not contacted by any agency in respect of the outstanding balance and the issue immediately affected my credit rating. The amount was also incorrectly captured in my credit report as thousands instead of hundreds. Bottom line is that I can't stress enough how disappointed I am in Telkom's service.