Airtel — deactivated no. without any info./ no record exists

Address:

560037

My name is akash baibhaw.
I have been using my airtel mob no. [protected] (Karnataka circle) for last 7 years.
All of sudden in dec 18, my no. Got deactivated.
The last recharge was done on 4th nov. 2018.
The issue is as below;
1. No prior info. Of deactivation via mail/message/call to mr. By airtel.
2. No reason could be provided by airtel store personnel/ customer care executive
3. Airtel system is unable to track this no. And can't reactivate.
Impact-
1. All financial transactions stopped.
2. Issue with trading
3. No call could be received on this mobile.
4. Mental stress and trauma.

Please help and let me know if any more details required.