Stained my credit report with no communication

We still awaiting the proof that Discovery communicated with us since yhe cancellation of the medical aid when Kieren resigned from his company who paid the medical aid on his behalf.

Secondly we are definitely taking this matter further because you listed this account as a default on his credit bureau that obviously has a negative effect on his account.

Thirdly provide us with a paid up letter that we can forward to the credit bureau and try to improve our credit report for an error made on your side.

Who is responsible for this and how can we remove that stain now that's going to last for freaken 24 months.