I can't make in app purchase contact apple support

If you are getting a message to contact iTunes Support then you can do so via this link and ask them for help (we are fellow users here on these forums, 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

In-app purchase

http://support.apple.com/kb/ht4009

Settings>General>Restrictions>In-App Purchases>On

I can't buy like things in my games