emails - about purchases that i have not made

I just received an email about a purchase i have supposedly made with an unregistered device .

When i click the sign in link on the email - i get a few boxes asking my bank details - this i did not fill out since i know i have not bought anything for about three years . I then returned the email and it just bounced back to me . I then loaded up iTunes - checked my purchase history and guess what? its not listed !

Im assuming this is a scam ? please can someone assure me apples store is concrete in regard to purchases ?

Has anyone else had this happen recently? i received this email early this morning...

Any enlightenment would be lovely - thanks.