Did you buy as a guest,which means your item won't show in your ebay account.
Look for the email you received when you made the payment as that will give you the info you need to make a claim with ebay for item not received.
More help here,Get help if you bought as a guest | eBay
If you still need help you can contact here, https://www.ebay.co.uk/help/eua?id=5275&mkevt=1&mkpid
Weekdays: 8 am-10pm
Weekends: 9 am-6pm.
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