Yes you are correct they are in breach of the act
From Schedule 3 of the Act
16 Display of minutes
(1) Within 7 days after a meeting of the executive committee of a large strata scheme, the executive committee must:
(a) give each owner and executive committee member a copy of the minutes of the meeting,
You could advise the EC that any decisions they have taken and any money spent was done illegally and if it happens again you will take action at CTTT to get the EC dismissed and forced to repay all illegal spending.
To take action at CTTT you would have to document all actions you have taken so far (letters emails, phone converstations) to resolve the issue. The first step is Concillation where the issues are tried to be resolved with a concillator and if this fails you would go then to Adjudication. Cost about $60 for each. The result is a foregone conclusion in your favour IMHO.
Also advise the SM of your intensions and see if that helps. Although the SM is better described as an administrator as they can make no real decision only the OC or EC can do that. In fact the SM might not even be given a copy of the Agenda or Minutes.