Airtel — My sim number is allotted to someone else

Address:	Mumbai
Website:	Airtel company

My Airtel number which I have been using since 5 years is allotted to someone else. When i call up the customer care number, I was told that it's because i haven't been recharging my phone for sometime now . Well I have paid for that sim and I have every right to do what i want. That number is very valuable to me and I really need it . Therefore I request you to look into the matter