This douche called and didn't even leave a message. Possible telemarketer or scammer.

Called and no message left. Telemarketer or scammer.

This jerked called and started with his bull line, so I do what I now do to all scam callers and scream into the phone so they stop calling me.  He called me back and let me a threatening voicemail that I will not see him, I will not hear him, but he will be watching me.  This guy is a scammer

I answered the call but got dead air and finally a disconnect.  Out of curiosity, I called back and got this recording: "Thank you for calling your local energy efficiency referral company" and so I learned 2 things.

1)  It's an energy clearing house, collecting potential numbers to distribute to others, probably solar scammers.

2). It's an actual live phone number, so not spoofed and not a VOIP call.  These latter seem to use random phone numbers that can't be called back, though I don't know this for sure.

Sales call, asking if you're electricity bill is over $100. He wants to sell you dual pane windows, solar, etc...