To save you time and money on future eBay purchases,  read how their 30 day MBG,  Money Back Guarantee works,  from the link below.  

As advised by others,  outside this period you have 120 days to claim with your payment provider.

Turn to Citizens Advice, if this was a UK registered business,  not upholding any given warranty, and you wish to pursue this further.

https://pages.ebay.co.uk/ebay-money-back-guarantee/

@8sally63