caran1 - 4:52 pm on Sep 6, 2005 (gmt 0)

I have a small website with 300-600 page views per day for nearly 8 months. For the last 6 hours , I have been getting 300 page views per hour for page abc.html . All these abnormal referrals are from google.de for a search string for which i am #1 (number of searches on overture =zero) . my error logs also show a string abc.html+-+15k. When I asked my hosting company to stop this attack, they say that your website is ranking high for this search term and all these visitors are legitimate. They also say that I will be charged for the extra bandwidth consumed.
How do i prove that it is hacking attempt and take action?