Mich. Comp. Laws § 493.60

Sec. 10. (1) Any person may file a complaint with the commissioner alleging that a licensee or registrant has violated this act or a rule promulgated or an order issued under this act. (2) The commissioner may forward the complaint to the licensee or registrant against which the complaint is filed. (3) The commissioner shall request that the licensee or registrant respond to the complainant and provide the commissioner with a copy of the response within a specified period. If the licensee or registrant fails to respond to the complainant within the specified period, or fails to handle the complaint to the satisfaction of the commissioner, the commissioner may commence an investigation or administrative action against the licensee or registrant.