You don't have to waste time negotiating with the seller.
Just read and use eBay's money back guarantee. Ther is alink to it in every listing, or see: https://pages.ebay.co.uk/ebay-money-back-guarantee/
Buying from sellers in China isn't like the High Street. The good news is it looks as though this seller's items are located in a distribution address in the UK. If this applies to yours there will be no problem with the return - eBay will require them to send you a prepaid return label if they want the item back.
