[VIDEO] Standalone AT&T Visual Voicemail Application on the Optimus G Pro (not messages)

I've downloaded this, but I'm getting two notifications. One from the call in voicemail, and then another one a few seconds later from the visual voicemail app. I went into call settings and put the notification to "silent," but still get two notifications. I've reset my phone to no avail. Anyone know how to fix this?