Kpn Travels — ignoring passengers demand

I traveled from chennai to trichy sleeper coach started at 2pm on 25th september (Bus no py 01ct 3199)
The ac was heavy and too cold inside the bus. The passengers were shivering.
When we requested the to decrease ac the drivers denied our request. They were sitting in the front near to engine. But the passengers inside were shivering with cold.
The drivers replied that they can not decrease the ac.