Threatening legal action

I didn't answer.  Caller left a lengthy message.  He claimed to be with the Treasury Dept, & indicated I had a problem which required me to call them.  Fat chance of that!  The voice mail was of such poor quality that it was difficult to understand.  I have received several of this type call lately.  It appears to be a recent variant scammers are now trying.

Threats of legal action if I did not return the call.

This guy called a couple months back threatening if I didn't call back I'd go before a magistrate judge for a criminal offense....etc. He said his name was David Grey but had a distinct India accent. He called again this morning at 8:19am before I even got out of bed.

Same as above - terrible connection, but picked up "magistrate judge", etc. Who falls for this stuff??