Hathway Cable & Datacom — harassment from hathway

Address:

Rangareddy, Andhra Pradesh, 500072

I took hathway services in 2016 or 2017 and i suffered a lot because the service was not good. I have disconnected the services and asked them to take the router as i am not going to utilize it. After a long time, i got a message saying that due to failure to surrender the router hathway will take legal action if i am not submitting the router.
I was shocked seeing that because i have never asked for the free router to install and when i spoke to hathwayagent ankababu ([protected]) he told it is free and need not required to give it back however if at all required hathway person will come and take it at the time of disconnection.
This is what he promised me and now hathway is ready for legal action for no reason. Even now i called the hathway to raise a ticket and also conference the call with the delhi legal team person pooja ([protected]) and someone ([protected]). Again the agent (Nikhil) from hathway told that the person will come and collect the router in 24 hr. Which is not happen again i got a call from the legal team this time when i called the customer care the agent (Sajith or sai) told me that it will take 30 days. When i asked him to tell the same thing to the legal team he disconnected the call.
I am not sure whom should i complain and what to do please suggest me and do the need full.