Mega Cabs — Cab driver cheated us

After arriving at KIA Bengaluru, i asked a mega cab assistant about rates for travel and he said 19.50 rupees. Then i checked in google maps, the total distance was coming 18km and so i agreed to go with cab. He talked to a cab driver and told us to go with it. I was traveling with KA 50 A 5059 cab now from KIA arrivals, at around 1530 hrs. And i realised the driver was not running on meter, upon asking he started arguing and denied from using meter. At the Airport exit checkpoint he made some excuse to show booking details to the sentry. Then he tried to take more money for tolls also and finally he did not even completed the trip. He dropped us at the bus stop of my area, 1km away from my home. All the way he was arguing for more money, there was no hint of proper behaviour.
The driver and the airport cab assistant person have formed a racket to cheat new users. Such people have become criminal minded.
He has taken 150 rupees extra from me. And such drivers license should be suspended, untill they learn their lessons