what happens when you choose 'delete' from your menu?
i had a similar situation, but a battery pull got rid of it. if that doesn't work, i'd say your next step is to do a wipe and restore, after you backup?
Same thing several times over the years, battery pull always worked, don't shut off first, just open the battery door and pull it, wait a minute or so and re insert battery. Wait for it to reboot and hopefully it's gone. Always fixed the issue for me.