HFACC called me and left no message, the number they called from is 1-702-912-8267. I give unknown numbers two chances to leave a message, otherwise, they will be blocked. I do not appreciate unsolicited callers not stating their intention for calling and will not be harassed by unknown strangers.
The number is Hillary Clinton's campaign making sure that you are going to vote on the 8th. The campaign used (312) 964-2567 based in Chicago, Illinois which I am assuming is the number they are using for all voters just in Illinois.
I personally would recommend just letting it ring if you are already registered and ready to go to vote in the election.