Collection outstanding amount

Firstly the mistake was done by the Ampath by claiming with the incorrect medical aid number then Bonitas rejected the claim. I picked up the problem and called Ampath numerous times since January to correct the mistake and assuring that the they resubmit with the correct information of which they failed until I asked them to cc me on the email when they resubmit the claim. On the claim the information was still incorrect , I corrected it and the medical aid paid now. I was shocked when I received a call from their collection even though I put effort trying to resolve this issue. I told the collection agent that payment is way, she advised to ask the Ampath agent to put the account on hold and it was not done. I specifically asked Winnie Letsoalo to do so. Now the account is paid but I the collection amount is outstanding :(