Airtel — neither providing service nor resolving the problem

Address:

Bangalore, Karnataka, 560095

I am unable to do outgoing call and not receiving calls from last night onwards. I have only airtel sim, contacted airtel customer service to fix the problem.
Response from rep: your sim is damaged and take duplicate sim,
My sim is not damaged i am damn sure 3 of my collegues who are using airtel also facing same problem.
They send me message issue resolved with ref no: rsewk[protected]. (But my issue was not resolved)
Tried again to contact them
Response from rep: dial #21# or #002# (For deactivating call divert) - told 100% will fix,
Tried again to contact them,
This time they were telling again some prank.

Conclusion: airtel is consuming money from customers and not providing services.