but you had previously said in your submission to the forum>
" I did not tell them what off-set I wanted other them tell them about the make model and year of the car - counted on them to do the research to know what off-set would fit or ask me for any other information if needed"
so Adz is correct is what he has said - you only told them what car you have, no further information. That is in your own words.
As you had also said " That's the power of the internet, nothing is too old.". What you say, is recorded for future reference.
Your ego is unbelievable; determined in your own mind ' it's all their fault". You state " I don't feel I have to share what Car I drive or what offset the wheels had in this forum " .. I think that as you've never actually said, what car you have, and what size you asked for, that you do actually know you've fkd up, but can't admit it to yourself.
Furthermore as per Australian Consumer law " a product must be reasonably fit for any purpose specified by the customer " . You're the customer. You didn't specify. I'll say it again, you didn't specify. One more time, You didn't specify. What there a problem with the product itself? Poor quality, cracked/damaged, missing parts, incorrect color? There wasn't, otherwise you would have disclosed this.
As someone experienced in court/tribunal matters, I really do think you should take it to VCAT...because you are going to get ripped to shreds, and be up for tribunal costs; possibly a claim of defamation from Koya as well. Especially as you have publicly acknowledged " With hindsight, I should have taken measurements and told them what offset I wanted.".
I must advise, I have contacted Koya warning them of your comments and your claim of proceeding to VCAT, and have offered to represent them in the matter free of charge, as I deal with these sort of ludicrous claims regularly in my occupation. They replied thanking me but obviously have their own legal department to attend to such matters.
Do yourself a favour - look in the mirror, acknowledge your error and forgive yourself for it, sell the wheels on gumtree and buy a new set specifying exactly what you're after , following your having done the necessary research to ensure you get exactly what you have requested.