Keeps calling, no message. When I call back, I get an automated message "thank you for calling." and it hangs up.

Called once yesterday and 4 times today.  Left no message.

Calls and hangs up when the phone is answered.

Have called 6 times so far tonight and never leave a message.

This number just called me and I heard what sounded like an old man's voice, but it was distorted and kind of shaky. It said something about "I asked you to...." something unintelligible. Then, "Please return the vote". And then it gave a phone number that I couldn't understand and hung up quickly.