Airtel — My Service disconnected

I don't know which world they are in, without informing they have disconnected my Postpaid [protected] connection.
The worst procedure is :
I need to enable my IR pack in the app which does not working.
So I called to customer care automatic telle caller is prompting my mobile number to key in, I did the same. It is saying OOps seems to be your number not correct.
My question is how it will work when my number is being in disconnected mode.
My friend visited near store, they're saying your number service is active, please enable IR pack.
But in my app I try to log out and login the OTP i am not receiving due to mobile number is disconnected,
They should have think alternative method to send OTP like registered gmail id if number does not work, '
I am in USA, now my number should be enable services .