Bangalore Auto — Very rude and cheat

There is an auto with no. KA 03 - 9337 . I had asked him to take me from BTM to Trinity Circle in MG Road. Initially he asked 20 rupees extra on the meter but finally settled on the meter. But I noticed he knowingly took a long path and when I was ahead of Diary Circle, I found his meter was fraud one and it was some 56 rupees from BTM till there. I asked him to stop the auto and drop me there and gave him 100 rupees as I didnt have change. He argued in a very bad way and took 80 rupees and went away speedily. It comes upto 30-40 rupees till that place . He was taking the entire 100 rupees and running but i had got hold of the auto. Please teach this guy a lesson. I would really want to get that 100 rupees back.