Where can I inform complaint on Karwa Taxi?

Where should I call to register my complaints of Karwa Taxis? Last month (previous day of EID) I got a Karwa Taxi from Al Sadd (in front of Qatar UAE Exchange) for going to my friends' room near Indian Embassy near Gulf Cinema. Normally I go there by giving 12 Riyals to Karwa Taxi. But the guy asked me QR. 25/- because of the roads are well traffic. I told him I can give you the meter charge. He said: I can't put meter because this traffic!

I have to pay him for the traffic jam! It sounds like, I have made this traffic! Its quite horrible! I asked him "What is your name?" He told me, "You dont want to know my name, you can note my car number". I asked him "What is your car number?" He said "that i wont say, you can note it from the number plate" I repeated both the questions for 3-4 times. He was hesitating to give me his name of number. At last he made his car aside and told me "get down here, i dont want your trip". I got down there and i noticed the car number.

But I dont know what should I do against such drivers. He was saying "You cann't do anything agaist me as I am here for the last 6 years". I thought what it means? He is behaving like this only because of there is no any strict customer care in Karwa, I believe.

Almost all the Karwa Taxi drivers are with very bad behavior. I dont know why. Once one of the driver told me that it is because of we are not paid well. Karwa has cut-down their commission and now they are getting their basic salaries.So every drivers are trying to make some extra money by doing like this and by hesitating to turn on the meter.

Karwa Authorities, please do something for them to behave better or pay them better. Otherwise such problems cann''t be wipe-out. Where will I get the justice?