What can I do renting issues?

Hello,this is how it starts.
Two years ago I moved state and into an apartment with a flatmate.
When I first arrived at the apartment there were a few issues with certain parts of the house, these issues included;

Bathroom: No fan, shower frame falling when bumped, black mould above ceilings.

Bedroom 1: walls cracking

Bedroom 2: walls cracking

The real estate company assured me that these problems will be fixed as soon as possible so I didn't mind so much.

Anyway down the track I started to experience a few problems, the first problem was one night we had very heavy rain, rain so heavy that it ended up causing a leak in our living room ceiling which was enough to damage a few very expensive electrical appliances including a laptop. I phoned the real estate agent informing them but I did realise there was not much I could do seeing as I did not have home and contents insurance. Of course they stated they would bring someone out to my house to fix the leak to avoid further issues, nothing was ever done even with several reminders. Today it started raining quite heavily again, this time also damaging various electrical appliances and once again moisture has soaked into the carpet, the moisture has also made cracks in walls worsen which is a big issue, not to mention it would not be good for anyones health.
During this 2 year period they have also increased the rent? am I entitled to any sort of compensation seeing as the tasks they stated would be completed have not been? please help