unable to do inapp purshase

What do you mean 'cant buy', wha happens when you try to do the in-app purchase, if you are getting an error message then what does it say ?

If you are getting a message to contact iTunes Support then you will need to do so (these are user-to-user forums) :

- go to http://www.apple.com/support/itunes/ww

- click on your country's flag

- click on the Contact Support at the bottom of the left-hand column

- click on Contact iTunes Store Support on the right-hand side of the page

If it's a different problem ... ?

If it also says to contact iTunes Support to complete the transaction then follow the steps in my above reply