Q: your purchase could not be complated for assistance contact itunes support

These are user-to-user forums, if you haven't already done so then you can contact iTunes Support then you can do so via this link and ask them why the message is appearing (we won't know why) : 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