My caller was working a free-home-security-system scam. Said he was from Security1 Systems which deserves to go out of business for their illegal marketing. These criminals knew I was on the don't call list.
Received call from this number on cell but missed it. Called number back and was given choice of speaking with someone or removing my number from their call list - which I did. We'll see how that works. They provided no information about the nature of their call to me or who they were, or what they were calling about - all very weird.