Need Legal Advice on unable to Stay during Notice Period

We stayed for 7 months at a rented Apartment in Pune and on 1st Nov we gave more than 30 days of Notice to Landlord. Due to some reasons, we had to visit our Hometown (Festival) & we were out of the station for 20 days. After the Landlord came to know that we went and the flat was locked, he started creating issues. Later once we came back, there were many prospective tenant visits. After we vacated the flat & handed over the keys to the Agent, we came to know that the Landlord would deduct the December rent as he has not got any tenant but there is no such clause in the Agreement that during the Notice period, we have to stay in the Flat. Would like to understand that the Inspection clause gives the Owner rights only after he initiates that he or his representative can visit but unless we are staying in the flat, he cannot exercise any strictness that we have to stay or give the keys to anyone. He is just Money- minded and has been abused, mentally agonized & harassed with harsh and Oppressive words. We want to file a case against the Landlord and teach him a lesson that we as Tenants are also Human so Landlords should treat them properly. Please guide us on the next course of Action to be taken and let us know if we are on the right grounds and what are Owner and tenant rights in this situation.