Charge Deduction For messages after Available Message Pack

Location/place: Bhilwara

Name of company/service: Bharti Airtel

I Am Airtel Prepaid Customer my number is 9784163035 . I made Recharge of Rs. 85 Which gives 6000 Local/National SMS for 30 Days on 06.06.12 But on 07.06.12 means less than 24 hours has been elapsed and company Charging Me SMS at normal rates of Rs. 1.5 and hen i called customer care i get the worst possible response .