I have a defective item which I want to return outside the sellers return period. Ebay cannot help

[elizer1]

I have a defective item (monobloc tap)  which I want to return outside the sellers return period. its advertised as a 180 trial with a life time guarantee, The seller is not contactable and appears to have blocked me.  Ebay cannot help so how do I escalate  this as its clearly a sellers con. And the ebay site does appear to have anyway of reporting or discussing this issue which is why I am raising this on the forum. 

[tsmgmd]

A lifetime guarantee is not your lifetime but the anticipated lifetime of the actual item.

Then you start with all the exclusions on the guarantee including the fitting and usage.

If you have a copy of the advert of the actual item listing you purchased and not a copy of a current listing or if you have paperwork detailing exactly what the guarantee covered and didn't cover you may be able to report it to Trading Standards.