Do not disturb issue?

[marvi0]

Hmm so I set up do not disturb to only allow my favourite contacts to come through. However some contacts not on my favourite list are still showing me when the calls come through. How to set up do not disturb so that I do not see the calls which are not on my favourite list please?

 

[marvi0]

Can anyone help me please. I have gone into settings and do not disturb and block all visual disturbances but when someone calls the phone app still shows on the screen. On mashmellow when I set do not disturb and anyone called me i could only see the notification on the notification bar so it didn't actually disturb me. On this phone it's not actually working can anyone advise please? Thanks.