Why does "New Voicemail" notification continue to appear constantly?

I have a new Google Pixel and an erroneous notice saying I have new voicemail appears every time I turn the device on. This happens regardless of phone calls I receive. I've tried clearing the cache, clearing data, clearing history, turning notifications off and on and then off again. All to no avail. I've tried everything except "Force Stop" which seems like a bad thing to do with the phone app on a smartphone.

Did I just make a mistake buying a Google phone?

Please help. Thanks.

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