How do I stop a pop up notification from WhatsApp or line?

I have turn off all pop up notification in both apps, I'm using galaxy s4 and Android 5.1 os

Welcome to Android Central! When you say popup notification, do you mean the ones that are limited to the notification bar, or the banner notifications that take up the upper 1/4 of the screen when they appear?

I'm looking for the same answer and for me, it's the large banner that pops up and covers the top of my screen. I've checked that popups for what's app are disabled both in the what's app settings and in the main phone notification settings.