Alliance — Local alliance broadband distributor is unwilling fix problem in the fiber optics of my alliance connection

Our alliance connection was given by a local den cable operator of Ananda Palit area called star line... Our internet connection always get disconnected every few month interval and they always say due to cut in fiber line... This issue is going on for 4-5years but now they say they can't fix it and order me to take new connection from other operator... Last time new connection cost me 1500rs for connection charge and now since they are unable to fix their problem they should compensate that new connection fee that would be required for opting for new connection as it is their failure and incompetence! But they are refusing to compensate nor agreeing to fix my existing line! Bunch of good for nothing people running as local distributor of alliance!