This number has called and left the same recorded message you described three times today, and it's only 3pm.
Very annoying but kind of hilarious. Except for the sad fact that the scam must be working on lots of people, or they wouldn't keep doing it.
I like playing with these guys. For this scam I told them I appreciated very much their offer of help. However I don't need it their help anymore but I killed and buried all the federal agents that try to enter my property (of course I did NOT do that, but they actually believed me).