For complaints against misbehaving auto drivers in Bangalore Contact the following:
Bangalore Centre - Koramangala BDA complex - 25533525
Bangalore West - Rajajinagar Corporation Complex - 23324388
Bangalore East - Indiranagar BDA complex - 25253726
Bangalore North - Yeshwanthpur corporation Complex - 23376039
Bangalore South - Jayanagar Corporation Complex - 26630989
Alternatively you can email the authorities at transcom@kar.nic.in
http://rto.kar.nic.in/help.htm
When you call them / email them mention the auto registration no., Date, time and place where the problem occurred and the problem.