I would go to their page on facebook and find the pet's page in the available for adoption section and in the comments ask if they are still available. Somrtimes they dont get back to you for a day though. Otherwise the way I have gotten through is to call 311 and ask them to connect you to speak with someone there.
Go to petharbor.com/chicago and look at the adoption section.
Thanks! Your answer is awaiting moderation.