Fizz Free Voicemail (upgrade level 3)?

I have reached level 3 and obtained 'FREE VOICEMAIL' for 2 years. I already have voicemail (like the vast majority of people here) ... I obviously refuse to change my plan because I don't want to lose introductory pricing.
Is this upgrade pointless since I already have free voicemail? Or will FIZZ credit/not charge me for voicemail for the next 2 years I apply the upgrade? I have found a few answers to this question online but none from a reputable source. Could a FIZZ employee please confirm?

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