You can report the violation to the U.S. Department of Justice, Antitrust Division at https://www.justice.gov/atr/report-violations. Or the California Attorney General's Office at https://oag.ca.gov/consumers. If possible, I would recommend discussing the issue with a lawyer before you report it. Many lawyers on this site offer free initial consultations, and can advise you on the best way to present the issue to the authorities, and protect any interests you may have that may be implicated by the misconduct or reporting.
