Pagadi system

I been living in pagadi room from 2008 in Mumbai ,the room is on name of my aunt, we were living in joint family ,but in 2009 my uncle and aunt shifted to flat and this room come under our share, but landlord is not considering us joint family members and treat us as tenant, and ask for extra rent for every year and if don't pay the extra rent (10000) , he refuses to paid the rent recipt of my aunt, what should I we to avoid this extra rent that the landlord ask for every year as rent share,