You need to be talking to Seller Performance. That’s the legal team. My mom had some return fraud, same person, second time at a new address. I proved beyond a doubt the damage photos were photoshopped and we refused to refund and refused to replace. We pre-emptively contacted Seller Performance before denying to take care of the customer as it was in a grey area of the seller contract. Seller Performance said it was our customer and we could do as we saw fit. A-to-z got all unreasonable with us and threatened to terminate our account until we referred them to the Seller Performance email stream. Yes, all this over a shitty pair of $5 sunglasses...but it’s the principle of the matter.
Talk to the lawyers. Be brief, clear and truthful. That’s your best bet.