Ask them for their company office phone number and address, and a copy of their sales permit and license to operate. Tell them you need it so you can call the County and verify that you're doing business with someone legally authorized to perform the work.
That should get them gone pretty quick. If they're willing to stick around while you check their credentials, they might be worth doing business with. But my guess is they won't stick around long enough to even give you the information you ask them for.
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