83 Ill. Adm. Code 600.170
Complaint Records
Section 600
Section 600.170 Complaint
Records
a) A full and prompt investigation shall be made of each
complaint received. The word "complaint," as used in this Section,
shall be construed to mean substantial objection made to a utility by a
customer as to its charges, facilities, or service, the disposal of which
complaint requires investigation or analysis. The receipt of all written
complaints shall be acknowledged in writing or by personal contact.
b) A record shall be kept of each complaint, showing the name and
address of the complainant, the time of day and date received, the nature of
the complaint, the result of the investigation, when and by whom conducted, the
final disposition of the complaint and the date of such disposition.
c) Complaints shall be summarized at least quarterly by each operating
office. Said summaries shall categorize complaints by type and number and
shall be kept for 3 years.