So you are using a third party in your deals? In this case it is binance. It is now understandable why they blocked your account. You tried to exchange customers money via third party exchange which has very strict rules regarding big deposits. That has nothing to do with your customer, because you did not inform him that third party exchange will be involved. He could exchange his funds HIMSELF on binance without your scammy assistance. The only reason he used YOUR exchange was the anonimous policy offered by you. Now you digged a hole for yourself with your own hands. Just return his money and deal with binance yourself because it was YOUR FAULT.