I wanted to gracefully close the connection. Not to get black listed by ISP. So not paying does not fit into my ethics.
As I mentioned in that long post, finally disconnection request was accepted, when I told him have you not understood what I said. That was enough to stop their meaningless argument and he promptly initiated disconnection.
Net@airtel have also confirmed it.
So no further action was needed on my part. I have started receiving retention team calls but I don't pick them up.
I am just going to write a follow-up mail after a few days.
This is more of experience sharing hoping that this gets indexed by search engines.
Thank you all.