Gorgeous Gecko (Kim) has replied with what appears to be two very reasonable solutions. A third option, IMHO, could be a partial refund, (and/or, possibly, paying the vet bill if geckos were seen by a vet), if pinworms are proven and the OP (Ryan) wishes to keep the geckos.
A refund is certainly due, at the least end, for the one gecko that passed away (with proof of its being deceased).
Of course, my opinion (or a portion of my opinion) could change depending upon whatever proof, communications, etc., that Ryan posts.... if those things offer something up that would cause me to change any part of my opinion.