Is there a way to turn off the one missed call alert. I've got into the Get it Now My Ringtones section and set the All Messages Set As as no ringtone but it still rings!

Here's why I need this like this. I need to have my phone on so only the people in my contact list will ring. I have it set that way and it works. I have weird sleeping hours but I get calls and I do have the restricted calls (calls not in the contact list) ringers turned off, but I still get the one missed call tone and it wakes me up! Is there a way to disable this.

I'm returning it tomorrow for a Casio Gz'One if I can't find a way because I know the Gz'One has this feature.

Thanks in advance!