Black listed me for a paid up account

Due to an instruction given to Nedbank Card division that was not adhered to, I was black listed just over a year ago. The matter was settled in full and Nedbank although forwarded a letter confirming all is in order - has not lifted my name from ITC. Been a year now and this judgement has not been cleared up. This is unacceptable as I was black listed due to the incompetence in their billing department and they do not have the audacity to clear up their mess. I want my name cleared off ITC (It has been a year now)