The SAU Feedback is for transactions that take part via SAU (ie the For Sale area, Trader area).
What happened to you is external to SAU.
Think like Ebay feedback - it's exactly the same principle.
You can't just go and leave bad feedback for someone on Ebay for something that had nothing to do with Ebay
End of the day whilst you might feel stronly about it, it has nothing to do with SAU.
Too some extent you harbour blame here too and hence SAU will not become involved directly or indirectly. Once you have a court ruling you are more than welcome to come back and name names. Don't care then as a court has decided.
Nothing wrong with people asking you via PM for the workshop name as i stated earlier, anyone with half an idea will already know who you are talking about anyway.
I know you might think I'm a cvnt for the view above, but there is a much bigger picture here.