Company Charging Me A Hefty Amount To Withdraw Money

There’s this company I’ve been working for for a while that has a certain rule that if an account has over 300,000 usd, the account owner will need to deposit 10% of the total funds in the account to withdraw money. In my case, I have over 1M in the account so the needed amount is over 100,000 usd. They claim that if it’s not sorted out they can freeze the account and the funds will be stuck in it forever without any chance of withdrawal: Is this legal at all? What are my legal options here? Would contacting the Federal Trade Commission or FBi help? Please advise.