yup. even with me the free adsl mb for the month was restored to 1024mb from 940mb. but when u view ur session history from 1st till date, u will notice that the remainder mb shows clearly that its been used by u. and thats what they will bill u on...the session history details from 1st to 31st of the month and not on the amount of free adsl mb remaining(under the account summary section).
dude i had used everyday. though i dont download in the day time but i used the net so i should be billed atleast something.and night time toh i downloaded loads, there isnt even a mention of it in the session history. but now its showing as usual. (actually this is only ususal for me )