Who called from 3132301109

on my answering machine a foreigner lady voice called me by my first name, cut off no message left.

First time getting a call from 313-230-1109 number. It  said on caller ID -->> Detroit MI.  March 21, 2014 @ 1:58 p.m. I just let the machine take the call, but  they left no message.

Received a call from 313-230-1109 and I returned it, but it went to a "non-working" number. Call was made at 6:31pm CST, 3/23/14

we have been getting a call from this number several times a day, 7 days a week for weeks.  Detroit Michigan,  Never a message.  How long will it take them to understand that we will NEVER answer?

They called for the second time tonight.  It's a ProLife organization.