CAC - California Association of Collectors provides state information and a consumer help/complaint line for California collection agencies: www.calcollectors.net
FTC - Federal Trade Commission regulates collection agencies in the United States. For questions regarding your rights under federal law contact the FTC at: FTC.GOV.
Credit Counseling - The Association of Independent Consumer Credit Counseling Agencies - AICCCA: The AICCCA mission is to promote quality and professional delivery of credit counseling services. AICCCA independent non-profit independent agencies assist millions of consumers annually with counseling and debt management services. Link here to AICCCA.