Shame there's still so many cunts in the world.
GENERALLY,this is a really cracking website where the decent members 100% back each other with a problem but as with anything else you do get a few bad apples chancing stuff probably in the hope that you'd change your mind fitting it,pass it on then he could claim "it worked when I had it".
I've said it for sometime on here and nothing's ever been done but IMO we should have a proper classified ads system where you have to provide the mods with a valid address,preferably landline number and bank details/proof of address,at least then if the parts were miss sold theres a paper trail to show where the bits have come from.
If your a genuine seller then why not do it?
The site makes it impossible for anyone who's had any association to the motor trade in some way or another past or present to sell goods unless they subscribe to business rates,which generally are too high if your not a full time business,but with paid classified ads the site gets some cash rather than eBay and the buyer knows there's a comeback route if the goods are wrongly described,which they clearly were in this case.
As usual,the mods are doing their best to sort it which is superb,just goes to show that this is a true community website but if banning him and offering the services of someone to collect the debt is the sites only route of comeback then something seriously needs too change.