Federal Trade Commission. Report telemarketing and robocalls at donotcall.gov or by calling 1-888-382-1222. These are the reports that feed most of this site.
Federal Communications Commission. File an unwanted call or text complaint at consumercomplaints.fcc.gov.
Your phone carrier. Most carriers offer free spam labeling and call blocking, and some let you forward spam texts to 7726 (SPAM).
Your state attorney general. Most states have a consumer protection office that takes complaints about telemarketing and scams.
Your rights under the TCPA
The Telephone Consumer Protection Act (47 U.S.C. § 227) lets consumers sue over certain prerecorded or autodialed calls made without consent, for $500 per violation, and courts may increase damages up to three times when the violation was willful or knowing.
For telemarketing calls to a number on the National Do Not Call Registry, a private claim generally requires more than one call within 12 months from the same company. Keep a record of dates, times and any company name the caller gave.