when requested to withdraw they are asking 10%

i put huge amount for trading and traded for a few month but when wanting to withdraw they ask 10% of total profit. its a huge amount and i asked them to deduct from the profit which they replied its not possible. Upon research it seems to be completely fake and scam. so requesting for help to withdraw my deposited fund i have all the evidence that i deposited to bank receipt. i will provide everything upon request.