Airtel — my aunt's mobile number is always not reachable

Address:

783345

I am siddharth from tura. And my problem is that whenever i try calling my aunt's number it says "either switched off, or not reacable". She lives alone in kokrajhar and the network on that area is superb! But still nobody can call to my aunt's number it says the same thing! But when she calls it reaches us smoothly. My aunt is an old women and she has no idea about all those things. From past 2 months the problem is persisting and i m tensed. I cannot leave from tura also as i have 24x7 hours duty here.
My aunt's number is - [protected].
So please take necessary action as soon as possible.😟😩🙇😔😔😔😔