Report scams online to the Federal Trade Commission at https://reportfraud.ftc.gov You can also call 1-877-382-4357. The FTC is the primary government agency that collects scam complaints.
Your State Attorney General’s Office can help too. Find your State Attorney General’s number here: https://www.usa.gov/state-attorney-general
Seniors are especially vulnerable to scams. If you have questions, call the AARP Fraud Watch Network Helpline: 877-908-3360
If you didn’t lose money and just want to report a call, you can visit donotcall.gov
Report the number that called you on your Caller ID, and the number the caller tells you to call back.