Our apologies, the parking in Chicago often does involve towing for non-compliance.
This does not mean you didn't pay, but you may have paid and made a mistake on your plate entry (very important that you enter your license plate correctly).
If you are towed at a Park 1 location in Chicago, please contact the operator directly for further assistance here https://www.park1chicago.com/ (contact form on website)
Park 1 zones are:
328 S Wabash ZONE 6550
50 E Harrison ZONE 6551
601 S Dearborn ZONE 6552
603 W Monroe ZONE 6553
623 W Monroe ZONE 6554
718 W Monroe ZONE 6555
762 W Jackson ZONE 6556
850 W Washington ZONE 6557