how do i report a phone scam?

See the following from Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

If you get a suspicious phone call or voicemail

Scammers may spoof legitimate company phone numbers and use flattery and threats to pressure you into giving them information, money, and even iTunes gift cards. If you get an unsolicited or suspicious phone call from someone claiming to be from Apple, just hang up.

You can report fraudulent tech support calls to the Federal Trade Commission (U.S. only) at www.ftccomplaintassistant.gov or to your local law enforcement agency.