Airtel — mobile number deactivated for travelling out of country

Address:	Coimbatore, Tamil Nadu, 641012
Website:	www.airtel.in

You have disconnected my mother's mobile number when she was travelling to us and when she came back and asked about the same the airtel office person responded negatively asking her to go and request to the new person who has taken my mother's number. How it is possible to allocate a number to another person without any consent or intimation. I am talking to my lawyer regarding the same to take necessary action against airtel to troubling my mother who is old.