Who called from 6605300573

I have received 11 calls from this number 8/16 and 8/17.  Four of these calls came today during Sprint NASCAR.  No messages.  As irritating as "you know what."  Help.

1. 660-530-0573 10:36 AM  8/16/2014 'MISSOURI_CALL'
2. 660-530-0573  3:20 PM  8/17/2014 'MISSOURI_CALL'
3. 660-530-0573  9:50 AM  8/18/2014 'MISSOURI_CALL'
4. 660-530-0573 12:43 PM  8/18/2014 'MISSOURI_CALL'
No message left.

Calls no one there.  On callback it says campaign voicemail.  Call from 6605300573

If you wait long enough, someone suddenly will say "hello"  They asked for my husband by name, I asked who was calling....all they gave was their first name, lol.  I then I asked what it was in regards to - they said it was a political survey.  Most real political surveys want to talk to anyone in the house and are glad to state who they are.  Just speculating, but my best guess is this type of scam -
http://www.itworld.com/it-managementstrategy/ ... t-got-it-s-scam

Called on 8-16-2014, 8-17-2014 and called 5 times today (8-18-2014).  Caller ID states Sedalia_MO.  Leaves no message.