Airtel — unnecessary balance deduction in my number

My airtel [bihar] number is [protected], i have recharged rs.100/- last time. But my balance has been deducted without any calls being made. I think airtel wrongly deducted my balance as it had happened last time also and they refunded back the same when i complained them. So kindly check & recharge back my balance. I have not used balance for anything else. So please check if balance is deducted for any other service mistakely activated and deactive those services.