Unauthorised purchase

Purchases are considered final as you know, but you could try the 'report a problem' page to contact iTunes Support and see if they will refund you as a one-off : http://reportaproblem.apple.com

Or you can try contacting iTunes Support via : http://www.apple.com/support/itunes/ww (click on your country's flag, the country where you live, and which is therefore the country on the account ; click on Contact Support towards the top right ; click on Get Help under 'Talk To Us’)

i received a bogus email thanking me for a purchase i never made. Unforchanately I entered my username and password, as the email looked a lot like apple.

until i looked at it closer , then i realized it bogus