Called the number back and an automated message instructed me to press '1' to have my number removed from there list after 48 business hours. I'm taking no chances so I'm blocking the creeps.
Just called 3:54 pm. It's a phone that I keep as an emergency one since it holds a charge. No one has the number but family. I flipped the phone open, so the call did come through. But no one spoke. I'll probably block it as a result of reading these other reports. Call came from Minnesota.