Call Elder Protective Services Hotline first to report abuse, neglect and financial exploitation of the elderly. Yes, ESPECIALLY a private or public guardian who is abusing their own client. They have a tendency to be the worst offenders.
Elder Abuse Hotline - 1-866-800-1409
If they have a Guardian ad Litem, you can report abuse to them also but CC the Judge. The "Guardian ad Litem" is supposed to be the wards attorney but in most cases, they're the attorney for the Guardian.
Illinois Guardianship and Advocacy Commission
http://gac.state.il.us/guardfaq.html
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In the state of IL, in order to be a guardian you need to be certified from the Center for Guardianship Certification.
755 ILCS 5/13-1.2
Certification Requirement. Each person appointed as a public guardian by the governor shall be certified as a National Certified Guardian by the Center for Guardianship Certification within 6 months after his or her appointment. The Guardianship and Advocacy Commission shall provide public guardians with professional training opportunities and facilitate testing and certification opportunities at locations in Springfield and Chicago with the Center for Guardianship Certification. The cost of certification shall be considered an expense connected with the operation of the public guardian’s office within the meaning of subsection (b) of Section 13-3.1 of this Article.
http://www.guardianshipcert.org/make_a_complaint.cfm
You first have to notify the court:
Judge Timothy Evans, Chief Judge
Richard J. Daley Center - 50 W. Washington
Suite 2600
Chicago, Illinois 60602
Telephone: 312-603-6000
Fax: 312-603-5366
TDD: 312-603-6673
So, file your complaint with Chief Judge Timothy Evans and CC the Center for Guardianship Certification.