NSW fairtrading is not a court. You can’t approach them to solve your issue. You need to approach NCAT.
Just to be clear, Fair Trading is not a court, true, but it can resolve issues by mediating an agreement between two parties to find a mutually agreeable resolution.
Critically, in most circumstances you have to apply for mediation at Fair Trading before you can apply for orders at NCAT. An individual owner seeking orders against another owner or their tenants (under section 153) would definitely require an application for and attempt at mediation which you would have to attend although the respondents can choose not to.
As Kaindub said, this is not a court, however attempted mediation is a necessary prerequisite for seeking orders at NCAT (in most circumstances).
The section cited for taking your strata committee to NCAT for failure to act is section 232 (2).