What exactly am I supposed to do with a phone call? (a) I cannot trust that it is who it claims to be, due to the last 2-4 years of caller-id / scam attacks (

What exactly am I supposed to do with a phone call? (a) I cannot trust that it is who it claims to be, due to the last 2-4 years of caller-id / scam attacks (b) I can't authenticate many shared secrets with the caller because most of my life details are probably now exposed via data breaches (and thus "open secrets") So no, there's no reason for me to believe anything a telephone call claims to be from or what the voice on the other end of the phone says they are. Why pick up at all? Authentication of legitimate official business is, in my opinion, the big problem of this decade.