i was trying to make in-game app purchase but i got message saying i must contact support. what does that means?

If you supplied a credit card, check its details. If not or they're correct, clickhereand ask the iTunes Store staff for assistance.

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iTunes [Store] Support - Use this form for assistance with account and billing, code redemption, or purchase questions - https://ssl.apple.com/emea/support/itunes/contact.html