Airtel, Prepaid No - [protected] — Fraudant,confusing& misleading sms s to recharge super value card

I am a prepaid customer of airtel, of orissa state, Although i have special tarif validity till nov- 2009, I got one sms that by recharging special tariff voucher of Rs 50, I could get Eastern region std calls at Rs0.70 p/minute. I recharge that spl tarif voucher but after that my special tarif validity was reduced to july -2009, This is disgusting that Airtel is misleading and abstracting fraudant charges with confusing sms.
Plese alert other customers...
Any body wants clarification plz contact me, E.mail- [protected]@hotmail.com