i have a text message that wont go away. i backed up all the threads i wanted to keep and deleted everything else and it comes back. i reset my factory setting and brought back my backed up messages and it came along. i delete the thread daily hoping against hope that it will just stay away. it is just one message of a thread that was 2 years worth of messages. it asks if i want to delete locked messages and i check the box and yet it comes back. every. single. time. how can i make it go away FOREVER