Landlord Not Returning Lease Deposited Amount

I am residing in Chennai. I am living in leased accommodation for the past 2 years and 2 months. The contract of the lease amounting to Rs. 6.5 lakhs with maintenance and water charge of Rs.700 had a tenure of 2 years without rent and without interest which was completed on 30th April 2019. And, I informed orally to the landlord before completion of lease period that I am going to vacate the house on end of the lease period and l asked him to arrange to return my deposited lease amount to me at the time of vacating the house. But he is still not arranged to return the amount to me. Every time when I am trying to ask my lease amount back from him and he is asking more time to return the amount to me. And also my 2 years lease agreement period was completed on 30th April 2019 itself. But I am still residing there without rent and without interest because he is having my whole lease amount of Rs. 6.5 lakhs and still he is not returning my lease amount to me. Is this any problem for me. And, how to return back my lease deposited amount from him. Please guide and advice me regarding the above issue.