3G ZTE m730m Dongle data runs out ???

Hi all i use a macbook ,been updated and using mavericks etc.
I recently bought a 3G ZTE broadband dongle to use for checking emails and just surfing ,not using it everyday or more than 30 mins at a time.
I topped it up on 2nd june 2014 ,£10 for 1gig of data and it ran out on the 7th june 2014,so im thinking it should not run out in 5 days ,when i have not downloaded anything,just checked some websites and emails .
So i was wondering if maybe my macbook internet settings are wrong and could be contributing in the data being used up so quickly.???
Any advice would be appreciated.
thanks .

With mavericks, the notifications feature will constently look for new updates. I would also like to inform you that 1gig of data is not alot and will most likely get used up within 5 days of emails and internet surfing. Try passing a day without using your email or surfing the web and see how much usage it uses up.
-tech

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