So far they've called me twice. The first time I heard a man asking my name, and the second, after I said, "Hello?" I heard an automated female voice say, "Goodbye." And the phone disconnected.

I too have been receiving phone calls from the 406-219-2921. Be wary as I believe this is a scam to get info from us. The calls are coming from a landline AT&T carrier  in Bozeman, Montana.  If this keeps up, I will be doing a skip tracing on the actual phone that calls me next time and they will be suprised when the officials show up.