When in the past any unsolicited phone calls asking for information I have always asked for there credit card details to pay for my time!
But now I just pass the phone to my Boss!
Zippy’s quiet for a few minutes and then starts quietly barking back to them on speaker phone 🐕🦺

Or
Do you like as an old friend did a number of times.
Just call back there number at 2am in the morning when you’re up for a early toilet break?