I keep getting calls from this number

Unknown caller from this number

EVERY  NIGHT AFTER 8PM I RECEIVED A CALL FROM THIS NUMBER.
I CALLED TODAY FROM MY COMPUTER AND THE ANSWERING MACHINE SAID
THAT IS A MAIL BOX SERVICE..

Received a call today and the caller claimed that they were taking a survey for the University of Illinois, with the purpose of identifying White Females and Black Males that may have early Symptoms of heart problems.  I was then asked if either of these two types resided in my household and whether I was a Black or White guy.  They hung up when I asked for more information about their organization.

They ask if anyone living in the household has problems with activites involving mild exersion.  Then they ask about your race and education.  Then they ask for your age.  Then they ask the year you were born.  After that they ask what month.  Then they ask for the day.  This sounds to me like a convoluted way to get at your birthday.  For whatever reasearch they are doing, they don't need your birthday.   Sounds like some sort of fraud to me.