From Consumer Wiki
The California Public Utilities Commission (CPUC) does not have jurisdiction over telephone equipment complaints; however, it does regulate telephone companies (phone services, including public and privately owned pay phones). The CPUC has the authority to carry out investigations and to conduct hearings on requests for rate changes, specific complaints, or broad policy matters. CPUC's role is to protect the consumer where competition does not.
Consumers may contact the CPUC for inquiries about rates or legislation.
California Public Utilities Commission (CPUC)
(415) 703-2782 San Francisco
(213) 576-7000 Los Angeles
(619) 525-4217 San Diego
(800) 649-7570 Public Inquiries