> Good luck with that, got to find them first.
Not difficult.
In my case, 99.99999% of time, it is some company I've never heard of.
But the person on the phone normally has the courtesy of giving their name and company name on the phone to introduce themselves, and normally I am infront of my computer and hence $insert_name_of_favourite_search_engine takes about three seconds of typing.
If their details don't come up on the search, then before slamming down the phone on them, I make sure they give me their website address which I validate.
Once I have a validated company name and/or website, I slam the phone down on them (sometimes accompanied by a few "wise words of advice") and the rest, as they say, is history.....