Water leaking inside property

I own an apartment in Melbourne located on the first floor. There are over 60 apartments on the property. Earlier this year, a leak started above the doorway leading to the balcony. My body corp does not think it is their responsibility and blames many of the leaks in the property on “poor housekeeping”. If I want to make a claim through insurance, it will cost me an excess of $2.5k.

I don’t really know what avenue to take. I can pay the money for the insurance claim or try and get the work done cheaper. I really think that it’s the body corps responsibility but they seem to think it’s nothing to do with them.