Car dealership networks keep records.
I would think that would be a prime candidate for a leak.
Some of what they do, is warranty related, and my dealership, one
day I went in there, there was a kind of "audit" or "inspection"
going on. And some disagreement about what the dealership had done.
And that kind of activity is backed up by computers,
databases, and the corporate at the center of it.
Banks are not exactly brain trusts either, but they're
a step ahead of car companies.
The same could go for chain or franchise businesses
such as a Midas Muffler.
On smaller businesses, their weakest link would be
their "CC processing company". Sometimes a small business
cannot do business with reputable outfits, and are forced
to use less desirable agencies. Just about every small
business needs at least one computer, because they need
to order parts from a distributor (windshields, mufflers,
crappy brake pads).
If the person has repair details, then the leak is
in the dealer network. If the person only
knows you went there, that could be CC processing
(she would know you spent $700 say, but would not know
what it was spent on, only the total for the bill
would be extractable).
A lot of the scam calls I get here, used synthesized voice.
But at least one person in the country, making calls
of this sort, got caught. And I'm hoping such cases
make these people "a bit more nervous". Even the call
centers in India, have had the odd police raid. But it
never seems to be enough.
Paul