Classic Collectibles Continental Collectibles, Global Collectibles, North American Collectibles, 21st Century Collectibles Scam selling collectible stamps Las Vegas Nevada

I just got a call from "Classic Collectibles" in Nevada. A quick Google search shows them at the same 2626 S Rainbow Blvd address as Continental Collectibles, Global Collectibles, and North American Collectibles, and just down the street from 21st Century Collectibles. Every one of the personalities of this multiple-personality-disorder company sells stamps and has scam reports for them online. I got the same pitch as everyone else who complained about them: allegedly called me 5 months ago (which they never did); I can get the last two collectible postage stamps with perforation errors for $1900 each; will make lots of money in a few years; I can refund on my credit card within 30 days; been in business for 30 years; etc. It appears that their scam is to get you to hold onto the stamp(s) until it's too late to refund (they can legit tell the credit card company that they sent you the stamp), then string you out waiting for them to sell it for you, which never happens.