Pagdi House

My dad was not aware of pagdi system in mumbai , he bought a house in 1992 and now it's been more than 25 years, earlier we use to give 700 rs rent and now suddenly landlord is asking to give 1000 rs rent every month and every year she is going to increase it for 100.so almost 80% tenant has stopped giving the rent since more than a year and landlord is not allowing us to sell the house and also sometimes landlorwill literally torture to all those tenant My question is 1.Is there any such rule for landlord to increase the rent and if yes than how much 2.its been more than a year we are not paying rent because she has directly increased the rent from 700 to 1000,is it gonna be any issue in the future for tenant 3.if properties goes for redevelopment in the future is it gonna be any issue to get a owner ship house 4.we bought house in 1992 that time house rate was 60000 approx and now if we want to vaccate the house landlord is giving only upto 1lk is there any such rules like that, and also if we want to sell they are not even ready us to sell the house Please answer for the below points