Who Called Us

Received 3 calls this week from MU(?). All from different numbers. They never leave a message. What are they wanting?

rec'd a call at 7:05pm on 7-5-2011 & we have never had any contact with the Univ of Mo so how did they get our # which is on the national dnc list.
this is the 3rd call so far this month & each time it is a different telephone # from the Univ. of Mo. - we want it stopped.

I don't want them to call me.

No idea what this call is regarding.