I don’t see why this would be an insurance claim (unless it’s a new building and you are claiming under the builders warranty and then their would be no excess).
Sounds to me like it’s it’s straight forward building maintenance and this is clearly common property and so it is the strata’s problem to fix and pay for. I’m assuming it’s rainwater comming in.
I would suggest you obtain a quote yourself to get the problem fixed and hand the quote to the Sec or SM and ask them to vote the issue (give them the option of getting their own quote) and give them say 21 days to get back to you.
[NB: The following advice applies to NSW. See above for the relevant advice for Victoria (where Marina lives)]
If they ignore your request or vote to do nothing you will have to take them to CTTT due to their failure to abide by section 62 of the act.
62 What are the duties of an owners corporation to maintain and repair property?
(1) 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.
The cost of going to CTTT is approx $160 and you are almost certain to win and force the OC to carry out the repairs.