Voice Mail tones

I do not have voicemail set up on my phone, however I occassionally see "New Voicemail Message" alert on my phone and hear the voice mail tone when I pick up my phone to make a call. I have been able to clear the Message using # key but have been unable to get rid of the annoying voice mail tone (stutter). I have called Comcast several times with no luck. Can anyone help me?

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