But I learned something here: MT799 is a well known African scam.
A MT799 is not a confirmed proof of sent money via Swift, actually its just worthless but can be dangerous.
https://www.linkedin.com/pulse/gold-fraud-scams-juliano-cunha/For sure the OP tried this scam. Unfortunately for him there is nobody selling 3000BTC to anyone here in this forum.
Are you generally aware of these terms ?! What the fuck is an African scam?
A MT799 is (POF) Proof of Funds! - this is an informational message that the buyer has money to buy at the time of sending this message. No more.
Next comes the signing of the agreement and only then is the payment and waiting for the coins.
No one asks to transfer coins before the seller receives the money.