what to do?

Right now. Its not negative seo as you may know it but rather its negatively impacting my website.

A hacker/spammer has some how and for some odd reason been for the past couple of days (along with other excerpts form other peoples websites) has been shoving my content on hacked pages thousands of them.. no links to my site... but on google if you search for my brand name dozens of hacked pages and spam appear below and if you search for extracts from my product descriptions I appear on page 2 and the hacked pages are above me...

They have ripped my home page content and multiple product descriptions.... and the best part is that I do not sell oakley glasses or stupid fake handbags and they are using my content when its totally irrelevant.