Hi Moxie
Unsure when you say agent if you’re referring to Strata Manager or Property Manager.
If you’re an owner, this should be simply writing to request the motion for the AGM via the scheme’s secretary. Just ensure that you give sufficient time, although it sounds like you have plenty of time at present still find out the timings around this, as having time to plan for major repairs to common property is ideal I know our scheme starts preparing quotes / budgeting around 3 months prior to the AGM.
As you’ve had no response from the strata manager / property manager I’d suggest as a next step you contact the strata committee (if you’re tenant cc the landlord’s agent) outlining the issue, the impact it has on you / other residents and what you’d like seen done to get some dialogue on the matter.
Failing the above it it’s a common property repair issue, you may want to request mediation via Fair Trading. https://www.fairtrading.nsw.gov.au/help-centre/online-tools/apply-for-strata-mediation