Love to know, I had a similar incident with a belconnen repairer, who took 3 goes to end up doing a crap job.
If it's against the forum rules to defame, then stating your case, saying who you are and who they are, what the facts, is not defamation.
I'm still waiting on Croydon to finnish my car since it was "done" months ago, a simple fact neither party is in dispute about. The mention of tuners/repairers is very common in threads.
If the forum rules say you can't name a company for fear of defination, then thats a matter for the the form admin and the usage terms.