OP I hope you do the right thing and refund their money. Put yourself in other people's shoes... imaging if you or someone you cared about got scammed, it's not a good feeling is it?
$150 may or may not be a lot of money but for some people it's their extra play cash that they've set aside outside of paying bills and other regular expenses and it's a major bummer to just lose that into thin air.
I hope this gets resolved peacefully
