Hi kapag gustong magaral ng hubby mo, he needs to apply for another student visa. As your dependent, he is only allowed to study for 3months.
Kapag hindi ka pumasok, you’re breaching the conditions imposed on your SV and chances are pwede kang ireport ng school mo sa immigration and they might cancel your visa.
Be careful when canceling your SV as it has implications. Kapag kinancel mo yung SV mo, that would automatically cancel your hubby’s dependent visa. I think the department will give you 28days to stay in Au before you become unlawful.
Try to book an appointment with AECC. Their services are free of charge before, I’m not sure now though.