Airtel — Mobile Number revoked without notice

Address:

Bangalore, Karnataka

Hello there,

I am in abroad on employment basis. i am using my airtel number on international roaming. however airtel has revoked my number into free recycle list without any notice. They claim that they had called me but I haven't received any such call. and now the number is revoked and this seems to me a serious security issue as all my bank are connected through this number for mobile banking.
I had called the customer care and they say they can't do anything.

Please guide me.

(will share my mobile number on request from an authorized person)

Thanks