Idea Cellular — Reduce mobile balance

I recharge idea sim with Rs-39 (they gave Rs 30+9 talktime call rate 2.4p/s).after recharge company reduce by Rs-8/ mobile balance without any reason. Airtel, Idea and Vodafone companies doing very wrong thing with customers. if customers did not recharge sim Card, they deactivate all services (including incoming and outgoing calls) and if they recharge some non-unlimited plans, they reduce mobile balance. customers have no options (one side is well and other side is bay). I has Rs-25.12 remaining mobile balance but it will also reduce within few days by idea company!