A google search for "312-263-4850" links it to the "Civic Opera Barber Salon".  I think it's someone from the Civic Opera selling tickets or their student program since i remember signing up at the website recently.  No message left.

I periodically get calls from 312 263 4850. Definitely Civic Opera of Chicago selling tix and season tix

312-263-4850 = subscription campaign for Lyric Opera of Chicago.
Need support and more audiences.

Ought to built up the new generation for opera goer.