Cant make purchase, says contact itunes support.
Cant purchase in app stuff says contact itunes support
iPhone 5s, iOS 7.0.4
Have you done so (these are user-to-user forums) ? If not then you can do so via this link : 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