The Chicago Bar Association has a fee dispute process
Yes, it does. But note two things. First, if your attorney is not in Cook County, IL, the Chicago Bar Association (CBA) might not help you. However, the bar assocation for the county where the lawyer is located may offer a similar service. Second, the CBA is not a government agency and has absolutely no power to force an attorney to participate in the fee dispute process or to force an attorney to reduce his fee in the matter. The fee dispute program relies on the willingness of both parties to participate in good faith to be effective.
If you haven't already, discuss your concerns about the fee directly with the lawyer and listen to his reasoning on the fee. See if you can try to negotiate a mutually acceptable agreement to settle the dispute. If that doesn't work, contact the bar association for the county where the lawyer practices to see if it has a fee dispute program. If it does, perhaps the lawyer will agree to participate in that. If it cannot be resolved that way, then the matter may have to be resolved in court.