Just need to completely turn OFF Xfinity Voice Mailbox

Cammby Thank you for taking the time to reach out to us here on our Xfinity Forums. Our team would be happy to see how we can help you with deactivating the Xfinity Voicemail. Please send us a DM to Xfinity Support with your full name and address to get started.

Click "Sign In" if necessary
Click the "Direct Message" icon or  https://forums.xfinity.com/direct-messaging
Click the "New message" (pen and paper) icon
The "To:" line prompts you to "Type the name of a person". Instead, type "Xfinity Support" there.
As you are typing a drop-down list appears. Select "Xfinity Support" from that list.
A "Xfinity Support" graphic replaces the "To:" line.
Type your message in the text area near the bottom of the window   
Press Enter to send it