Charged 12 bitcoin! What service did you render to them to be funded with 12 BTC just like that? Bruh it's the new scam technique, although not that very knew cause I had similar experience on my Trust wallet account I do use as burner wallet, received some lucrative amount of USDT from a source I don't even recognise this date requesting I can withdraw the amount only if I could just deposit in $50 as transaction fee. Days later the funds vanished since they observed I wasn't falling for the cheap scam.

There's no free money online, don't be deceived, you would lose all $1000 if you dare to pay. Reject the scam as it's not an offer and close down that account if you can.