Mac Looming

I just an email from linden below. To my knowledge I have never had an avi named roxanne, I evendid a 'forgot me user name' check using the email address linden sent the email to to checked!! I check my credit card and no money has some out, it checked and my cc wasnt even valid with the new viewer its been so long that I was on SL? Any ideas? Dear Roxanne, Thank you for using the LindeX Exchange to buy Linden Dollars. Your account has been charged US$10.38 You purchased L$2500 Thanks again - we look forward to seeing you in Second Life! Linden Lab and the Second Life Team