HE CALLED???
The stupid. It burns. That’s a traceable felony. What did the FBI agent say when you called them to report it?
unfortunately, you’re not likely to ever find them. the world of voice has been infected with SIP services such as skype. they use throw-away accounts and exploit compromised systems owned by clueless users to proxy through. it’s only occasionally that they unknowingly utilize a honeypot planted by law enforcement as a proxy that they ever get busted... and then 90% of them are freekin Ukrainian, Russian or Chinese and there isn’t a damn thing you can do about it.