It's not half your fault if you asked twice and nothing happened V.
This is very much the landlord's responsibility.
https://www.consumer.vic.gov.au/hous...urgent-repairs Getting repairs done - Tenants Union of Victoria
This is not you being a bother...this is making sure you have a liveable dwelling to live in.
It's also helping the landlord in that these repairs need to be made ASAP before the problem gets worse and affects the structural integrity.
D