I think I would probably ask for (at least) a partial refund. Then either buy some ameruacanas from a reputable breeder OR if you don’t mind the leakage and are only concerned with egg color, you could raise up some cockerels, pick your favorite one, and have him genetically tested for blue egg gene. (I have used The Silkie Lab and recommend them, it’s $25 for the blue egg test.) Then you will know if he has two blue egg genes, or only one. If he does have 2 copies of the gene, you can be confident about his daughters all laying blue or green eggs.
However if you are wanting a bird that is closer to the ameraucana standard, then I would probably get more eggs and go from there.
I think it’s great that you educated the person who is selling those eggs, I hope they change their ads to reflect what they have learned!