Received several calls from number - no messages left. Very rude.

I have had at least 5 calls from this number.  I thought maybe it was a cell phone number from someone I know (I live in the same state) or something but no one is ever there when I answer.  Now I see I'm not alone.  Bizarre.  I can only block 10 numbers at a time on my phone, so I guess I'll remove something and block this one.  As for a disconnected number when you call back (question posted here) that happens all the time with the calls I get from "card services" trying to get me to sign up for a low interest card.  Generally those come from Florida.  Once it was from a real business.  I think they somehow have it fixed to show up as a fake number.  This person probably isn't really even in Glasgow MT.

Called this number immediately after they called me because no one talked when I answered the phone. Called the number back and it was disconnected.  I have no Idea who or what they want.

Same results as other posters here. Did not call back. Thanks for reporting your results. I would be wondering otherwise.
I store these numbers as 'do not answer'. If I do answer, I point the phone towards a loud radio...just to pester them, of course.