The National Fraud Information Center is your source for Internet and telemarketing fraud information.
Phone: (800) 876-7060
http://www.fraud.org

National Do Not Call Registry makes it easier and more efficient for you to stop getting telemarketing sale calls you don't want.
Phone: (888) 382-1222
http://www.donotcall.gov

AARP consumer protection against fraud.
Phone: (800) 424-3410
http://www.aarp.org/research/frauds-scams/telemarketing

Federal Trade Commission
Phone: (877) FTC-HELP (382-4357)
http://www.ftc.gov

U.S. Department of Justice
Phone: N/A
http://www.usdoj.gov/criminal/fraud/telemarketing