This is not only me who is victim of ABC Broadband. But you can fins many more on their own site. Few months ago I got the call for payment of 2 years before closed connection. Some layer called me and threaten me to settle the issue out of court. They also sent me a legal notice and threat me to file a criminal activity case against me. See this https://article-stack.com/discussion-2/harassment-by-ABC Broadband-internet-service-provider.amty
This time they are not refunding the money for the service they are not able to provide. They usually don’t reply on mail. And if they do, they take 15-20 days. So worst.
Please launch complaint on pgportal.gov.in.