Blacklist blocks a number and display blocked call on notification area so that you don't miss any call (even unexpected one). If you want to completely mute blocked calls, let's disable blocked call notification. Please follow below steps

  1. Open Blacklist
  2. Click on 3-dot button, then "Settings"
  3. Click on "Others"
  4. Check/uncheck "Notification" to enable/disable notification of blocked calls.