Landlord entered my flat without notice and changed my locks, is this legal?

I'm staying in a rented apartment in Bangalore. Yesterday, I returned from work to find my landlord had changed the locks on my door without any prior notice. He claims I violated some rental agreement terms, but I wasn't informed or given any written notice. His actions have left me locked out of my own home. Can he legally do this? What are my rights as a tenant in such a situation?