More energy/solar telemarketers.  I think they just keep getting new numbers.  I called the number back after I hung up on the guy and got the "this number no longer in service" recording.  Block call, but unfortunately they will just keep adding new numbers to be blocked.

Just called today. No message left. Yet, when I called them back, recording said number not in service. Is most likely a VOIP caller/scammers sitting at a computer in a library.
Rule of thumb is, if ya don't know the person/number, screen the call and never pick up.

Are VOIP callers/scammers, and they can manipulate the caller ID to be shown on your phone when they call.

Allen from some HVAC company called. I said to him why does your number on CID say invalid? he mumbled something and I told him I cant work with invalid companies. he shot back and said you are invalid and hung up on me. CID actually said Terry MCIrvin, Spoofed number and name, but I like to give them a shot since they annoy me on average with 34 calls per month. I really wish we could stop this nonsense, but it is money to the congressmen from all the Telco's that keep this alive and hounding us.

I never pick up, if I don't know the person or business behind the CID.  All calls go to an answering machine. No message left.  CID said Terry McIrvin, and I didn't know anyone by that name.