Who called from 3128097040

Just got the same call on cell phone.  No VM.

VOTE CHALLENGE
Call received Tuesday 11/11/2014 @ 1635 from 312-809-7040
Claims to be from Chicago Election Board. He said my vote had been challenged, and for further info I should call 773-495-6365

nov 26 2014 -- got call from this number but no msg left.. telemktg?

Scammer's couldn't wait until Thanksgiving weekend ended.
Received this call early morn, Monday Dec 1, 2014.
No message left.

I called this back after the 5th call in two days. It has an automated response that says "this is not spam. This call was regarding important politics in your area". Really? Then why did they hang up when I answered?