db – Peter’s suggestion that you combine all of your queries in one post was a reasonable one, but the problem now is that some of the individual ones have already been responded to, so as all the issues are loosely related, as you seem to have a good handle on each of them, and as it seems that no resolution is possible, I’d suggest that you get your evidence such as correspondence, notes, dates, and times together and take the lot to Mediation.
The NSW Strata Schemes Management Act (1996) prescribes how Mediation can, if unsuccessful, proceed to more formal resolution in the Strata Division of the NSW Civil & Administrative Tribunal (NCAT) but you need to give Mediation a try in the first instance.
There are two avenues for you to initiate Mediation, one is provided by the NSW Department of Fair Trading and the other, which I recommend, is via the NSW Community Justice Centre.