Hi, Strata’s response seems to sound more than reasonable if they have organised the plumber for the tenant in the first place, and at your request, and then followed up.
I’m afraid I have to disagree. If, as Mark180 said, the plumber identified an issue with the waterproofing, then trusting that fixing a leaking tap will fix the problem isn’t enough. Waterproofing is there in case things go wrong, such as an overflowing sink, blocked drain, burst pipe or, indeed, dripping tap. Fixing the thing that revealed the waterproofing had failed is not enough. The strata committee or the lot owner (if they have renovated) need to fix this before another accident occurs.