Stop harassing me & confirm this matter is closed

I was contacted by MBD late January regarding an outstanding Vodacom account; I have supp**** the m the POP as well as the paid-up letter from Vodacom confirming that the account is not in arrears.

I am contacted 3 to 4 times a day by their agents asking for their money, this is despite sending a POP & paid-up letter from Vodacom.

I have yet to receive any confirmations from MBD that this matter is closed, this is despite me contacting MBD numerous times telephonically and via email to request that this matter is closed as well as that I am removed from debt review.

I'd like this matter resolved as a matter of urgency