Did he really call it an "Elon Mask" giveaway? I'm sorry for your loss and I don't want to laugh at you, but that would make the whole situation hilarious. Scammer couldn't even spell it right and still managed to make money from it.

Is this a joke post OP, or did you really send them 0.2 BTC because they said your transaction is not recognized by your system and you have to send another one? Even if this was a legit giveaway, that should be a big red flag.