Rental agreement termination before possession

We had taken a flat on Heavy Deposit for my parents. However there was a breach of trust we decided not to continue with the agreement due to delay in giving the possession of the flat. There were multiple leakage and pest issues. It was not livable. I had to move my parents with me in my inlaws house. Since the amount was paid to the owner we did not have any money left get another property on rent for my parents. As per the agreement the owner mentioned we cannot empty till 1 year as per the agreement. However we manage to convenience to find another tenant which he was able to do post 2 months. He deducted the charges for the painting and the pipe fitting he had done. He mentioned he will deduct the brokerage and other fees of approx 25k and refund the balance. The new tenants already moved in and he is delaying the payments giving unnecessary excuses. Somehow we managed to get half of the deposit however still more than 1.5 lakhs is still pending with him. Please advise what action can be taken as unable to move my parents since the funds are still stuck with him.