I called the number back and a recording said "The survey you are calling about has ended. If you would like to be removed from our list for future calls press 9."
I received a call from this number on my cell phone. I did NOT answer because I left the Chicago area and moved out west 11 years ago, and I don't know anyone who lives in Chicago that would be calling me. I searched the # on my reverse lookup app and it came up as Pro Chicago Ltd. I've blocked the number and will be reporting it to the National Do Not Call registry.