i think if you check vic raods, they are illegal full stop.

I feel for nick, most people come accross dodgey tradies now and then and have paid for work to be done. but if it was a cash job (as most would do to install these) and no reciept then there is no grounds for a complaint. also the trades place is not supposed to fit them in vic as they are NOT legal. especially if a roadworthy place as well.

No grounds for action here against the business, just dont go there again or get any one else to go there.