Airtel — outgoing service stopped

Address:

829107

When i purchased an airtel sim (No.[protected]) in 2007, the validity waa puro 2034. Since 2007 i am using this sim continuously and never let the balance become 0. Today, even i have a balance of rs.39/- they stopped my service and my balance shown is rs.0. This is, i think, a great unjustice they did to me.
Kindly, look into the matter so that my airtel sim service may restore or atleast the balance amount of my sim may refund back by which i can recharge with a plan they want.
With regards,
Amolendu das,
Bokaro thermal,
Jharkhand.