Your message to me was "Your purchase could not be completed. Contact iTunes
Your message to me was "Your purchase could not be completed. Contact iTunes. I don't understand the problem.
Most of the people on these forums, including myself, are fellow users - you're not talking to iTunes Support here.
You can contact iTunes Support via this link and ask them for help (we won't know why you are getting the message) : http://www.apple.com/support/itunes/contact/ - click on Contact iTunes Store Support on the right-hand side of the page, then Purchases, Billing & Redemption