Blocked/Private Phone Calls Going Directly To Voicemail

I've already tried to resolve this through my carrier and they couldn't help me. Why do Private/Blocked numbers go directly to voicemail? I can't seem to change this (unblocked numbers continue to ring and let me answer it).

Also, I'm using Nova Launcher and can't find the stock phone app in my list of apps. Any idea why I can't see it?

Michael

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