There are several major league scambaiters who refuse to call American scammers due to unfamiliarity, refusal to acknowledge scammers beyond tech/IRS exist, refusal to acknowledge that Americans can be scammers, because the scammer has taken great steps to ensure they appear legit, or because they refuse to belief that legit companies are not capable of illegal business practices.
I suggest review of FTC rules for scambaiters who are unfamiliar with them.
Telemarketers must transmit their telephone number and, if possible, their name, to your caller ID service. This protects your privacy, increases accountability on the telemarketer’s part and helps in law enforcement efforts. -ftc.gov
Federal Communications Commission (FCC) regulations prohibit telemarketers from using automated dialers to call cell phone numbers without prior consent. Automated dialers are standard in the industry, so most telemarketers are barred from calling consumers' cell phones without their consent. - ftc.gov