Zinca Xue

I got two versions of the email below today. I logged into Secondlife.com and on checking my account found that there were two transactions today which I didnt authorise and which cleaned out my account. Who do I contact in Linden Labs and how do I contact them? From noreply@secondlife.com "An attempt to purchase Linden Dollars for your account via the LindeX page on secondlife.com has failed."