Q: CANT MAKE IN-APP PURCHASES

We are fellow users here on these user-to-user forums, you're not talking to iTunes Support nor Apple.

If you are getting a message to contact iTunes Support then you can do so via this link and ask them why the message is appearing : 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

same problem for me to but i purchased a 5 dollar app then 1 hour later i tried again it didn't work

If it's the same problem then the same solution that I posted above applies