I mentioned this in another thread, so many sellers listing stones as "Escher", when in fact they are Thuringians, if even that.
For a stone to be called an, "Escher" it must have the label, or remnants of a recognizable label. Even selling a stone in an Escher labeled box, with no label on the stone, you don't know for sure what you're getting, so it's very much "caveat emptor".
I'm sure a nice Thuri would be virtually indistinguishable from a labelled Escher, but I'd go to a source for a Thuri stone and know I'm getting a Thuri.
Sorry for your bad experience JOB15, I'm thinking it's one thing if you lapped it, can somewhat see the point of not wanting it back, or at least returned without a full return price, but to have in fact been given an entirely different stone, not even a Thuri, if that's the case, I would think a full refund and an apology would be in order.