I was a subscriber, but I don't like to be pushed on the phone, I can get my decision base on mail, e-mail and just information from friends. Here you can find advise from Chicago Symphony Orchestra representative about calling to ticket office and asking to be removed. IT WILL NOT WORK!!!!! they like parasites will never let you alone. All my very good attitude and impression from concert are screwed up by this people, who calling me EVERY DAY almost, different time, and I blocking all phone numbers, but they calling from new and new numbers again and again, They worse than any other telemarketing
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/
Your number won't be removed from the current funding campaign, so it can take a couple of weeks to stop getting calls from them. You shouldn't get calls during future campaigns, though.