Hey there! I can certainly understand how frustrating it is when you're still getting update notifications after updating the device over and over. I would suggest using smart switch to push the update fully through in case it's stuck! You can also back up your information and do a factory data reset following the below steps just to refresh anything that may not be pulling through the update!
Navigate to and open Settings, and then tap General management. Swipe to and tap Reset, and then tap Reset all settings. Review the information, and then tap Reset settings. Tap Reset to confirm.
If you try these two and the update still won't pull all the way through the next thing I would suggest is to have a certified technician take a look at the device.
