Well, I would contact the seller, ask what matters to me, and keep it for the record. Would that not be enough? And if you DID reach out for the content creator, who in return provided false information, you should deserve the refund undisputed. (And if I couldnt reach the creator at all, I wouldnt have bought the asset to begin with).
And it is only natural that Epics decision seems fair to me. After all, I havent agreed to their terms of use for no reason.
Nevertheless, reading this thread gave me the impression that there is need for improvement, which is why I suggested that you should have voiced your complain as feedback, hoping that that will resonate more with Epic