Vodacom's incompetence in closing expired contract accounts

I have requested Vodacom to close my contract account after it expired. I was given a settlement that I needed to pay to close the account which I paid. But vodacom hasn't closed the account on their side and keep sending adverse information that I'm in arrears to the Credit Bureau. This is affecting my life negatively as I'm trying to buy a house but can't get approved due to Vodacom's incompetency. I have proof of my communication with them via emails. I have sent multiple emails to different departments in trying to resolve this but to no avail. And I have spoken to them telephonically as well, hence I got the settlement amount.