How can I delete all of my old voicemail messages at once?

How can I delete all of my old voicemail messages at once? I have a Moto X 1st Gen.

The only method I know of to bulk delete voicemail is in the Voicemail tutorial. It involves opening a help ticket.

Delete Voicemail

Note: If your voice mailbox has at least 500 voicemail messages, you may open a Help ticket to have all but your most recent 50 voicemail messages deleted in bulk.

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