It is always better to return item than ask for a replacement,which you wouldn't be covered for,so open a return request for item not as described,and the seller should send you a prepaid return label and refund you within 3 days of getting the item back.
Don't let the seller run you out of time with false promises,and get you to close the case as they can't be reopened,simply escalate the case to ebay within the 30 days of opening if you get no label or refund
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