From reading the thread below, it looks like this is just as I suspected...another scam/troll. So annoying when you're dealing with limited minutes on a government cell phone that has no way of blocking anyone.
I didn't answer, left no voicemail. Sounds like another scam call. Oddly enough I have received 3 in the last 24 hours. I wonder if lots of people are seeing an uptick in these kind of calls.