I bought a $650 pair of sneakers from Ebay that were covered by their authentication guarantee.  The seller states that they sneakers were in good condition with no defects when he shipped them.  They arrived damaged and are practically unwearable due to a warped/melted sole, as if they were exposed to heat or something.  Ebay claims it is a manufacturing defect and that there guarantee doesn't cover manufacturing defects.  How can it be a manufacturing defect if the shoes didn't have the damage or flaw when they left the seller's hands?  I've filed an item not as described return which they denied and they then denied my appeal.  Is there anyway to escalate this to Ebay?  Order #21-14345-97575