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. 

[tobiasd4]

Ebay do not get involved with guarantees beyond their own 30 day MBG.

If it was UK buisness seller, contact Citizens Advice