In the past, calls from unknown numbers were mostly flagged by my carrier as "Scam Likely". Now the "Scam Likely" calls are rare, & every suspicious call is flagged "Charity Call".
The numbers don't seem to match any listed charities, so I don't think the scammers are simply spoofing known charities. Have they found a way to trick the carrier into tagging their number as a charity?
I don't answer & they don't leave a message, so I don't know what the scam is.