Yes that issue seems similar and shows how difficult it is to get in contact with the right people.
The only thing I can prove is that I never got the e-mail that the deposit was credited because the site was down (without my knowledge).

It shows as completed on FBC and the blockchain, but the funds were never credited to the account. When the site came back up it was still showing for pending for a couple days.

I then did a small test deposit to see if I can trigger anything to get it credited. Maybe that added to the problem.

Only they can look into my account and see that the numbers don't add up. I only got a standard reply from Fin, who runs the customer support that they will look into it.