Seller is ignoring my messages

I bought a set of headlights over 90 days ago from a company on eBay. They seemed fine and I took my car for an MOT and about a month ago. The mechanic told me that the adjuster motor on one of the headlights doesn’t work and the headlight needs to be replaced. This is something I wouldn’t have known without taking it for an MOT. 
I contacted the seller as the listing stated they had 1 year warranty and they agreed to send me a replacement if I sent them a video of the issuer. I did this and now they are ignoring me. I’ve sent them a number of messages asking them to respond to me but they continue to ignore me. They were expensive and I have no way of rectifying this without buying another set of headlights. Is there anyway that I can raise this issue with eBay and get a refund as the seller is not honouring the warranty? The only thing I can seem to find is the Ai online chat which is less than helpful. 

You cannot report this to eBay as they do not offer warranties or guarantees on items, just that they are just as described on receipt.  If they are not,  a buyer has 30 days under eBay's 30 day MBG,  Money Back Guarantee policy,  to return the item for a full refund.

 

You are too late to claim a refund from eBay,  but can try your payment provider,  most offer a 120 day buyer protection policy.

 

If purchased from a registered UK business, who offered a guarantee and is now not upholding this,  then turn to Citizens Advice for your next steps,  if you wish to take this further.

 

@diolan13