Feedback for faulty item and unpleasant seller.

[mcbg1160]

If I buy a product that is faulty but the seller implies I'm lying so no return, how can I then give negative feedback to warn others? 

[plpmr]

Warn others of what?

If you open a not as described case the seller has to accept and pay for the return.

https://resolutioncentre.ebay.co.uk/