Microsoft Azure blocks new subscriptions due to a $24 unpaid invoice that cannot be paid or resolved through support

A user has a $24 autopay charge on their Azure account that failed, and the invoice is locked in the billing portal with no way to pay it. This blocks them from creating new subscriptions or spending thousands on Azure services, and they cannot contact support because it requires a paid support plan, which is inaccessible due to the billing block. They have exhausted all official channels, including phone numbers, chatbots, and APIs, without reaching a human or resolving the issue.