i'm with you on this one, i used to work in student housing and have also taken my landlord to tribunal and won.
my big piece of advice is GET IT IN WRITING. DO NOT ever make it a conversation, get it in writing, keep copies, and send it by REGISTERED MAIL. email does sometimes count but nothing is more legal than a letter sent by registered mail.
in your letter, always give them 7 days to fix it - or a timespan telling them when it must be solved.
make use of your local/state agency that deal's with tenant's rights. in my state its
Tenants Union of Victoria