See section 81 of the Strata Schemes Management Act. (4) If the owners corporation is subsequently faced with other expenses it cannot at once meet from either fund, it must levy on each owner of a lot in the strata scheme a contribution to the administrative fund or capital works fund, determined at a general meeting of the owners corporation, in order to meet the expenses.”
Note the word “must” – if the OC lacks money to carry out its duties, as approved at a general meeting, then the OC must raise a special levy to fund them.
So the AGM agenda should have either a motion to raise the regular levies to meet those expenses, or alternatively or additionally, have a motion to raise a special levy to fund the unexpected costs.
If the owners refuse to fund them, by voting down the motion, then you (or other owners) can apply for an Order at NCAT to make this happen.