You should've reported it on Facebook, the post and the user posted such scam. They might still be lurking around the social media, doing everything to fool un-knowledgeable people. Do you still have the link of the post? It might help stopping the actions of the scammers, especially prohibiting their IPs from using Facebook and other social media.
If that was just a little scam attempt, then they might not be knowledgeable nor had any guts to post here in forum, as even some starters in here are already awaken with dozens of scam out there and how scammers do it.