Class Action, page-27

It is up to the company to comply with listing rules, shareholders can make complaints to the asx if they feel disclosure or listing rules have been broken and the asx will then investigate.

As already posted, you have to be able to prove in court that you have suffered financial losses and prove that this was through the actions of the company/directors which is no costly exercise. No win/no fee is generally not for share market class action cases, sometimes for the high profile ones so you will be out of pocket a heap to start with and a heap more if you lose.