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If you have a union, join and get them to offer support. Some have solicitors available for these cases to consult on your next steps. You should be able to use all your sick leave. Don't quit.

If not lodge a claim with Fair Work Australia. You only have so many days to lodge a claim there.

You could also hire a hire a solicitor if you want to take it to court for Civil damages.

Your employer has a responsibility to protect its employees, especially if it is a known issue.