Have a look at the
terms of service, it goes to the extremely impracticable extent to state in Section 19 Disputes Resolution (19.1):
All disputes and disagreements that might arise from these Terms shall be resolved by means of negotiations.There is zero recourse available for any customer/client to seek a legal dispute. They have not stated which country they will allow jurisdiction in the event there is litigation and for those very same reasons they cannot confiscate $8000 from the OP under dubious and deliberately worded terms and conditions of using their platform.
No government agency is going after them or will go after them if they return the funds to the OP but they are portraying themselves as a law abiding entity yet they themselves are not even registered as a company/LTD/LLC in any jurisdiction therefore they are claiming they are in the Seychelles is an attempt at a smokescreen.
OK, so based on this information I come to two conclusions:
1. Absolutely nobody should be using FixedFloat. The BTC taint analysis should be conducted before they send funds to the "main address." This way, the funds can simply refunded to the sender if they are found to be unacceptable according to their standards. What FixedFloat is doing is a bad business practice.
2. OP's employers are still on the hook for paying him the owed amount.