I typically don't post on these, but with the limited amount of info, It kinda sounds like you're looking for problems after getting a different limb core. I'm not sure if that was his mix up, or an issue that was overlooked with an online order, or mail in? If it was done over the phone I'd say thats more on him.
To me a crack is a crack not a light coloration in a fine line under the finish. Its hard to point fingers, with all the crazy things I've seen people do to bows over the years . Look on the other page, a guy basically set his widow on fire.......
Regardless, I would say a refund shouldn't happen unless he did a switch on the core, after a phone conversation at the time of the order. It makes it a little more complicated, that you shot it for as long as you did.
After all that, I understand buying something and not being happy.