I received a robo call from this number saying legal action was going to be taken against me in regards to my tax return. The English in the prerecorded message was terrible, which is how I knew it wasn't real.

person said they are from the FBI and there are documents that would lead to my arrest.  I just hung up.They immediately called back, I didn't answer and they hung up.  Very noisy background noises (like a call center)