My account is disabled on App Store and iTunes

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

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

Many people have, upon reading the article, posted to these boards instead of using the link. It shouldn't be suggested, except in the rare case where someone's trying to fix the issue by changing their payment information.

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They already did. They asked this question from that article, and the method provided by it is the same as the first one I gave,

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Which, despite your protestation, might not be immediately apparent to the OP.

YMMV