Airtel — about deactivation of prepaid number suddenly

Address:

Kapurthala, Punjab, 144401

I was airtel number [protected] for 4-5 years. I converted it into a prepaid as i had to come abroad for sometime but still want to use this number. But after i converted to prepaid, it worked for very less time. Now showing that this number doesn't exist. How it can be possible. I even recharged it after it gets converted. And all of sudden, it shows that number is no more active. If they have to do any such things at least let the customer know. Kindly activate it again as i have submitted this number at all my bank accounts and other important places. I cannot change it everywhere as i still have to live abroad for some more time.