How to re-enable a disabled Media & Purchases account in the App Store?

How can I enable my Media & Purchases Account in the App Store?

When I try to purchase an app from the App Store, I get a message saying, "Your Media & Purchases account has been disabled. Tap Continue to request re-enablement." Pressing "Continue" redirects to a page saying, "There are currently no assisted support options for your selection available."

How do I reenable my account in this case?

[Re-Titled by Moderator]