Bharat Sanchar Nigam [BSNL] — Landline dead from long time

My landline line is dead from a long time. I don even remember the last time i used it. And the last time i used it, it used to get frequently disconnected. I am only paying the bills.
I called customer care, but it says request already raised, i called the lineman his number is switched off or is out of coverage. I called the exchange, but its shut down now because of covid. I tried to disconnect the landline but there is no option online.