Ya man, i download the excel files regularly mate (atleast once a week), and even they show usage of 2.5GB till 31st evening! I used depending on what the portal showed! Now they've added all things in between i think, as i said in earlier post that the download limit sometimes shows MUCH more that it has happened even if its in idle mode. And the case of 400MB without any single file downloaded by pc. It just can't be due to modem-bsnl server communication! What the servers are sending images and movies to say "ping" to modem or what?!
I don't know man, they should not mislead like this.
---------- Exactly man, that is why i followed it till 31st and it agreed with 2.5GB!!! and now only on 1st of sep its saying 3 GB!!!

I'm not sure if it'll work. Man, these days when the private ISP's and telecoms are begging you to take postpaid connections ONLY to get a chance to rob you, BSNL doesn't do that. Thank God for that!
I was just mislead by the portal due to improper usage calculations. I should pay for incompetent billing service! But i think i'll end up just paying the extra amount no matter what i try.