I try to purchase but I cannot why?
I Buy iTunes card 50$ then i try to buy gems for clash of clan but I cannot cuz i change my apple Id what to do now need help
We are fellow users here on these forums, if you would like help then you will need to provide more information than 'try to purchase but cannot'. What happens when you try to buy them, does the 'buy' button not work, do you get any error messages ... ?
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 (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
If it's a different problem ... ?