Issue between rental family and the landlord

Hello Sir/Madam My name is Nimisha Sureka. We are a family of 6 members residing in a rental flat in Jaipur. We took the flat in April'17 and living till now. We have an agreement of 11 months with landlord. We pay our rent in advance (in cash) in the first week of every month. Now this flat has been sold to another person. Ex-landlord asked to vacant the flat as soon as possible. We told him, we are ready to change the rental agreement in the name of new owner. But he denied. He is threatening us to vacant the flat in 8 days and he has also removed the electricity meter, now there is no electricity at our place. And also sent a letter by post stating that we are not paying rent since May, pay the entire amount till now and vacant it as well. Is this a way to treat someone. We also suggested him that we will vacant the place but we need charges for shifting or bring Packers and movers yourself. We are a middle class family, it is not easy for us to change places in every 3-4 months. All our furniture, ACs shifting to a place will require charges. Please help us, what we can do, I'm not a student of law. That is the reason I'm sharing my issue here.