Hathway — Torture from Hathway for re-activating connection

Address:

Bangalore

I was using hathway customer account [protected]. Due to the extreme poor service disconnected it and returned the device 15 years back .
15 years I’m peacefully using other service providers, but from the last 6 months I’m getting continuous calls from hathway to reactive the connection. Once when I said to them that I’ll never be a customer to hatchway they changed the stand and asking me to return the device ( which I have returned 15 years back) or pay 2500 Rs charges!!.
15 years there was not a single call or email from hatchway and suddenly they waked up. They are harassing me with calls every day. After so many follow-ups they marked this in Service Request 07112022W412037 that the device is returned and they deactivated my account.
But still I get continues calls from hatchway, in each call I mention this SR ticket and they confirm that the device is returned But next day I’ll get a call again from hatchway.
I’m fed up, please take an action to avoid the harassment from Hathway.