Reliance Communications — Plan stops before the expiry

I stay in surat(gujrat). i have reliance prepaid cdma connection. In the month of december i refilled it with rs 1500 in which reliance to reliance calls are totally free in all over india for one year. but just before two days they stoped this plan without any notification. i contact reliance web world but they didnt replied properly. How can they stop my plan before the 5 monthswith out any notification ?
wat i do? where do i complain about this.