Who called from 2183393920

I received a call from this number about 1/2 hour ago. I don't know anyone in Minnesota so I didn't answer it. No message and when I called it back, I got a recording saying "The number or code you dialed is incorrect."

When I call it back it's always busy.  They don't leave a message.

Same thing happened to me.

This number called me, I call back, Busy Signal. No Message.

jsut called me no message left, I called back and said not in service. weird

ps
Maybe its the lizard people trying to reach us.

Called left no message