Asianet — Low speed

I am an Asianet subscriber. My account no. is TR3987. The connection is very slow. The office of Asianet has given me two telephone numbers. But, they are not taking the phone when I call them to lodge this complaint. If this continues, I will be compelled to change my service provider. I am not changing this provider only because I have to choose another provider from Kerala only and I do not expect any better service in Kerala.