Hw i can stay in australia and wht i have to do ?

i have this visa 820 and im saprated around 10 month's and 2 day's ago immigration called me and they say if u didnt get back to ur partnet till 1 jun ,,thn u have to leave australia in 28 days ,,and its not fair ,,i have benn 2 years and 4 months and i really not ready to go back ,,so wht should i do ,,to stay here and continue my life ,,thnks