I received an email from ITunes showing a purchase I didn't make. The link to cancel requests credit card etc.

Don’t submit any personal information there, forward the email to reportphishing@apple.com as an attachment, and then delete it.

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It is a phishing attempt. Do not respond. Do not divulge any personal or financial information.

You can use the address below to forward the suspect email message to Apple.

reportphishing@apple.com

The link below has information to help identify fraudulent emails.

http://support.apple.com/kb/HT4933