Unable to Withdraw

When my total account balance was nearly $20,000. I was suddenly charged a 25% "Account Balance Tax". ($4,786.5). I asked for an explanation, they said "it was the rule"; "this is the only way". I refusedI reduced my overall account balance to about $9,000 and the "Tax" was still $4,786.5I asked them why and they said my account has been locked and I have to pay a deposit fee on top of the 25% total balance tax to be able to withdraw. I asked for proof and they still gave none.