Delay in Updating Credit Listing

FNB handed me over to Barrett & Associates without me knowing. Once I got confirmation I settled my credit card in full in the beginning of December (04/12/2019).

Barrett & Associates have received the money in their bank account and said they only allocate funds on Wednesdays & Fridays - two Wednesday and Two Fridays have now passed.

FNB has listed my account as still owing 53 000 on the account last updated in 2017, now when applying for a home loan the banks are asking why did I only pay 16200 which was the confirmed settlement amount as at the 04/12/2019.

I can't get a closure letter from FNB as Barrett & Associates are not updating their system, when I phone FNB directly they say it's not in their hands I need to wait, but I do know when settling debt your credit score need to be updated within 7 days.