Missed call notification shown even in auto rejecting or deliberate rejection? I have a Galaxy Note 8.0 N5100 tablet which is updated to the latest version of Android (4.2.2) using the following official ROM from SAMMOBILE.

My problem is even when I deliberately reject someone's calling, there's a notification shown like this: 


    


This is really annoying for me because I have put someone in my auto rejection list, but whenever he calls, this notification is shown.

I did factory reset, and now the problem is fixed. But can anyone help me pointing what was wrong? Is it because of the Android update?
Problem is fixed. The answer is I had "Any.do" app on my device. I feel like a fool now because instead of thinking about uninstalling an app, I thought that it may be a software bug so I updated my Android version.