Luckily I was online when this call came in so I looked it up really quick. Once I read this post I elected not to answer it. They never left a voicemail.
Rec'd call on my cell from this number, no message, so I called it back. Got recording informing me I have one day to "opt out" of telemarketers to my phone, I just need to verify some information. Yeah, right. Hung up, blocked caller. Went online amend checked that, yes indeed, my numbers are still on the Do Not Call Registry. Evidently they have moved on from the Energy Scam.