Banks in Illinois are regulated by the IL Dept of Financial and Professional Regulation. The links below provide information regarding filing complaints against banks with the IL Dept of Financial and Professional Regulation:
http://www.obre.state.il.us/default2.htm
http://www.idfpr.com/
The Better Business Bureau is another place where unethical banks, financial institutions, and businesses may be reported:
http://chicago.bbb.org/Contact-BBB
The Federal Reserve is another place you may file a complaint:
http://www.federalreserveconsumerhelp.gov/complaintinfo.cfm?info=9
Here is the link to file a complaint with the Federal Reserve.
https://www.federalreserveconsumerhelp.gov/FormComplaint.cfm
Here is the link to file a complaint with the Federal Deposit Insurance Corporation (FDIC):s is the link to file a complaint with the FDIC -
https://www2.fdic.gov/starsmail/index.asp
Here is the link to file a complaint with the Attorney General's Office:
http://illinoisattorneygeneral.gov/consumers/filecomplaint.html
Consumer's Financial Protection Bureau is another place to report banks. Here is the link:
http://www.consumerfinance.gov/blog/the-cfpb-wants-you-to-blow-the-whistle-on-lawbreakers/