Write to the strata manager and the secretary of the committee (they are bound by law you have a mailbox on site) along these lines.
Dear Secretary and Strata Manager
As you have failed to address the issues of urgent repairs that I have brought to your attention on numerous occasions (quote dates), I am hereby giving you notice that if these matters are not properly addressed and remedied with in two weeks from this date, I intend to:
a) Pursue an action against the Owners Corporation under Section 62 of the Strata Schemes Management Act, which says “An owners corporation must properly maintain and keep in a state of good and serviceable repair the common property and any personal property vested in the owners corporation.”
b) Pursue an action under Section 138 of the Act which says: “An Adjudicator may make an order to settle a dispute or complaint about … a failure to exercise a function conferred or imposed by or under this Act or the by-laws in relation to a strata scheme, or … the operation, administration or management of a strata scheme under this Act.
c) Subsequently, use the evidence of negligence in the above matters to seek the statutory appointment of a strata manager, under the provisions of Section 183B, to replace the current strata manager and executive committee.
That should get their attention.