We cannot action anything as we are members like yourself, but we can explain how you need to proceed to receive a full refund as you have received a faulty item.
If you cannot find the item in your purhcase history it seems you bought it as a Guest Purchase, so nothing will show in your eBay account, as it wasn't used.
This will explain how to receive a refund now:
https://www.ebay.co.uk/help/buying/returns-refunds/returning-item/returning-items-bought-guest?id=4065&st=12&pos=1&query=Get%20help%20if%20you%20bought%20as%20a%20guest&intent=guest&docId=HELP1151
@legends1576