Airtel's got some serious chronology problems, look at the two messages I received this morning (check the time stamps).
Message from 121
07-07-2011 8:32AM
We wish to confirm the receipt of your payment for Rs. 276.85. Please note cheque/ECS payments are subject to realization. View/Pay your bills at www.airtel.in
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Message from 121
07-07-2011 9:47AM
Your Airtel Mobile Bill dated 03-Jul-2011 for Rs. 276.85 has been generated. It will reach you by 14-Jul-2011. Due date: 21-Jul-2011. Dial *121*13# for bill details.