Adding to the advice above, your seller is in China but the location of the air frier is the UK.
So if your seller tries to tell you that you have to return it to China take no notice and escalate your case when the time comes. Ebay will enforce a refund.
Do not close the case early no matter what the seller says.
Incidentally I doubt if Trading Standards will be able to help as your seller is not in the UK.
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