lisainberea,
Another option would be to reset settings. Keep in mind this will evert all of your settings back to default but will not delete your data:
"You can return settings to their defaults without erasing your content.
If you want to save your settings, back up iPhone before returning them to their defaults. For example, if you’re trying to solve a problem but returning settings to their defaults doesn’t help, you might want to restore your previous settings from a backup.
- Go to Settings
> General > Transfer or Reset iPhone > Reset. - Choose an option:
WARNING: If you choose the Erase All Content and Settings option, all of your content is removed. See Erase iPhone.
- Reset All Settings: All settings—including network settings, the keyboard dictionary, location settings, privacy settings, and Apple Pay cards—are removed or reset to their defaults. No data or media are deleted."
Additional details can be found here: Return iPhone settings to their defaults
Hopefully this helps. If the issue persists, can you provide a few more details. Are you referring to iMessage messages, emails, or another type of message? Also, which device and iOS version are you currently using?
Cheers!