Airtel — airtel invalid number

I was using airtel sim from past 8 years.
I have linked all my aadhar, bank to same number. From 26th-nov-17, it is saying invalid number for incoming calls.

I have contacted airtel store and customer care and below is there reply.
"your phone number data is not available with us".

So, request to guide how to get it.
Sim details:[protected]u
Mobile number:- 9845xxxx07