I bought a $39 per month mobile broadband plan last year, it offers 5 GB every month, and my Windows computer could show the usage per month, so I follow it to ensure I do not overload, otherwise I should pay extra. I am very sure I never used over 5GB every month from last year until now. However, it charged me $165 for November, 2008 and even $335 on Feburary 2009. I was really shocked because it showed I just used 2.56 GB for Feburary. I took all the evidence to the shop, they told me the window showed on computer is not accurate, if it is not accurate, why it shows on my computer!!!it is really ridiculous!! What makes me angry is the shop I signed for this service, the manager told me they could not do anything for me. I told them why for the previous months, there was nothing wrong, they said ' maybe you were lucky for those months'!!! Such product and service, how can a consumer convince Vodafone any more!!! I am an international student studying in Australia, the money is I earned by working part time, it is not only the money, but it also consists my valuable time on it. If anyone who could tell me any way to solve this problem, maybe talking to some manager of Vodafone, plz help me!! Thanks~