[Resolved]  Reliance CDMA — unnecessary deactivation of phone in last 7 days of the month

dear sir i have a postpaid connection of reliance cdma([protected]) in up east, kanpur . it was a prepaid connection before 3 months & i have converted it now in postpaid.after conversion, i have taken plan for for rs.199 for free unlimited calls in all over up. we have already selected an another plan of free sms for rs.60 per 1000sms... and they have given us an another plan of rs100 for 300mins. free for other phones in east up...& i have diposted rs 500/-security money and last three month my bill is never cross the limit of rs500/-.but after activation of postpaid connection, the co. (reliance) is always warning me that my billing is exceeding the limit & it will be suspended if i could not deposit Rs.500?400 Extra...
before a week they always de-activate my connection when i ask for billl then they said that my bill will be generated after 5 th day of every month...and further they added that till i not deposit some amount to them, , they will continue the de-activation of out-going on my phone...
i requeted them that our billing amount is not so high, , so plz do not de- activate your services...
every time when generate our bill, , , , , it is proved that our biling amount is not exceeding the credit limit of rs.500/-
Instead of all that we are facing the deactivation every month without any failure for near about 10 daysss... so plz tell us what next step to take...