If you can't use it,and seller can't help you either, then look to open a return request for item not as described in listing,and seller will have to supply you with a prepaid return label and refund you within 3 days of getting the item back.
See here,if your witthin 30 days of the estimated delivery date to comply,https://www.ebay.co.uk/help/buying/returns-refunds/returning-item?id=4041
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