If you have ever made a purchase Clarion, Amazon will still have your details including the card you used then, if you failed to uncheck the keep my details box. If for instance someone has tried to purchase, and the card used when you did buy from them, has expired, this may have triggered an email from Amazon. I would go onto the Amazon site and sign inif you can remember the details you used, or ring the number provided by Amazon to check the validity of the email. If Amazon have not emailed you they advise you what to do.