It's been a while since I used a Verizon phone, so this might not help--but are you able to go to Settings>Apps>All, select Visual Voicemail, and Force Stop/Clear Cache/Clear Data? Then leave it completely alone. I recall that with the old Backup Assistant Plus, as soon as I opened it, it started causing all sorts of issues, even though I never set it up. But if I Force Stopped it, and cleared all cache and data, then left it totally alone, it would stay closed. (There was no Disable option for it.)