28%? Is the phone rooted? That's about the point at which a rooted phone will abort an update. (You can't update a phone that's been rooted, even if you remove root in most cases.)
Go to the Tab 3 section of XDA Forums and see (or ask) if anyone has, or can post, that update file.
Welcome to Android Central! Force a shutdown by pressing and holding Power and Vol Down for about 10-15 seconds. Then try booting into Recovery Mode and wipe the cache partition: https://support.t-mobile.com/docs/DOC-27393