If you don't wish to receive fundraising calls from the Chicago Symphony Orchestra, call 312-294-3000, and tell them so. This has worked for me. Source: http://cso.org/plan-your-experience/privacy-policy/
I just got one the other day. Things like this make you not want to give out your number! Have the decency to leave a voice mail!!! Maybe I'll call back, but if I don't, get the hint!!!
I kept receiving calls from this number (with no messages left) & when I called it back, it was the Chicago Symphony Orchestra. I don't know why they'd be calling me, but it's probably about donating money.