Missing item

Ordered a item which shows as being delivered but I did not receive it. I have co tasted the seller who suggested I open a case but following the instruction when you press on more actions it only give me the option to contact the seller which I already have can someone advise how I can start a claim for eBay to step in

 

thanks in advance 

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Here we are open a case in the Resolution Centre,  for item not received.

 

https://resolutioncentre.ebay.co.uk

 

It gives the seller 3 days to refund you,  if they do not,  escalate on day 4 and eBay step in and fully refund you.