Being told account is disabled when trying to buy storage or access the app store

There's a problem with your iTunes Store account information which can't be fixed from your end. Click here and contact Apple Support when they're open; if the link doesn't have an option for your country, use this form.

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Most likely a billing issue and can only be resolved by contacting Apple at the provided link here:

If a message says 'Your account has been disabled in the App Store and iTunes' - Apple Support