What I thought was with this particular scam from Googling as well as from the messages I got it seems they insist you talk to them via Telegram all the time, because an end to end encrypted service is harder for the police to trace if they ever went after the scam.That's a very common scam I have had it happen to me also and I have heard others on here who have had the same thing but like you I could see straight through it and told them to piss off.