ITunes problems
Trying to download apps and I put my payment informaton tell me to go to - www.apple.com/support/itunes
iPad, iOS 5
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It means you need to contact iTunes support.
Either start on the web page you provided:
iTunes - Official Apple Support
Or contact Apple on:
Contact Apple for support and service - Apple Support
There you can also find a phone number to dial for most countries.
Good luck!