Excess debit from my prepaid account

At times my account balance is debited even when a call is received. I have deposited Rs.50/- from no. 157012 on 6th May 2009 at 9.38 am with ref no. 157012. After receipt of message regarding credit of amount, I have made following calls.
9777616650 – duration of call 00:00:00
9777616650 – duration of call 00:00:14
9338805413 – duration of call 00:00:23
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