My previous landlord, Sudhakar Reddy, owner if House no. 203, 20th main, 4th cross, btm 1,cheated me..what should I do?

Q: I lived in house no. 203, 20th main, 4th cross, btm 1st stage, 3rd floor in a 1rk flat. I had committed to vacate the house on 10th Aug. I shifted all my luggage to another house on 9th Aug and went to the landlord Sudhakar Reddy to ask for the refund of deposit. As he was not there in his home, I went upstairs to my room and waited. I had a flight to catch early morning. He came to my room at 1 am that night and asked me to vacate. I told him that he is late and thus can inspect the house now and finalise the refund amount which I can collect while leaving five hours later in the morning.
To my surprise, he created a big mess at that time of the night and unfairly cut 12500 extra from my deposit and forced me to leave the house at that time of the night. I urge all the people who are looking for a house to not even think of having him as your landlord. Strictly beware.

Also if anyone knows what action I should take against him, please suggest.

I am in Bangalore.