Possible excess Data package usage in Samsung Galaxy Grand I9082?

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http://forums.androidcentral.com – Dear All Thus far I have been using Samsung Galaxy Ace GT5830i. I use the same kind of apps in my newly purchased Samsung Galaxy Grand I9082 now. Most of my usage pertains to Facebook which I access via Dolphin browser. Just 12 days into my billing cycle, I got a warning message from the service provider saying that I have only 200 MB left of my 1 GB data limit! Although there has been no major change in the amount of my usage. I experimented by switching background data off, checking my data limit, and then all I did was just browse Facebook as usual in Dolphin for just about 5 minut (HowTos)