Airtel — Airtel Broadband issue not resolved for more than 7 days

I am facing frequent internet disruption issue past few months. The service engineers visit and do some temporary fixes. Now, after I raised the last ticket on 28th April. They said they will replace the Router box to fix the issue, but its been more than a week now. no one responded. If I call the customer care to disconnect my line, they are keeping my calls on hold for more than 30 mins and then asking to wait for another 48 hours.

LandLine NUmber : [protected]
Lat SR Raised : [protected]