House owner not giving the deposit back

Hi, We rented a place in Hyderabad from feb'18 and gave a deposit of 2 months (80k). One of the flatmate had to leave in 5 months and the owner knew about that. We starting looking for his replacement 1.5 months before he was about to vacate. But since the room wasn't that good, we couldn't find anyone. The owner was kept updated throughout of our struggles of not being able to find a replacement. Some people gave us token money and then never showed up. So by 20th of June'18 we informed the owner about the same, that its really hard to find the replacement and we might have to vacate at the end of the month. He did not mention anything about not giving the deposit back. Even the rental agreement does not mention this. After we moved out, he said he will give back the deposit when someone moves in. A new tenant has been living there for the past 10 days and the owner is still lying that nobody is living there. Moreover he is mentioning some damages that are a complete lie. I was wondering if there is something we can do, since it does not look like he will give anything back and he's been lying to us the past 10-15 days.