Pagdi Chawl Rent Increase

We are a group of residents living in pagdi system building having 50 rooms and 7 shops in South Mumbai. The owner of the building keeps increasing our rent giving reason that the Bombay Municipal corporation has increased taxes. The information provided by the BMC to us reveals minor increase in property taxes . The BMC information also reveals outstanding taxes ( mainly cess tax ) of around 5.5 lac Rs. till date.