Update: about 15 minutes ago, I received a call from this number again, but on my cell phone as I was driving. I suspect it was from months and months ago of inquiring about online schools on the internet. Never ever REQUEST information unless you are positive it is a site for that particular accredited school. I would email them directly that request, not from the school's website, actually.
I would have called, asking if they are the next of kin of "Shannon", using an authoritative, official sounding voice. If they say no, then let them know that their number showed up on caller ID, and you would like for them to come to the station for an, uh, "interview".