BLocked Number STILL able to leave me a voicemail

I got around 6 Spam calls from 1-800-461-9845 in the past 5 hours, I obviously blocked it. Its an automated message saying there is a problem with my social security number, Obvious fraud attempt. Even though the number is blocked, the phone will not ring, but it will go into voicemail still. How is that even a thing? How to not allow it to go to voicemail?

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