Volume won't stay off. Mute option not available.

[AC Question]

I have a brand new Note5 (three days old). There is no mute option. The volume is either on or vibrate, both of which wake me up. Where is the mute option? It's where it is with every it her phone I've ever had... With the volume control or On the drop down screen.

Also, when I turn the volume down as soon as a notification comes in the volume turns itself back on...rendering it useless to turn it down to begin with. This is not cool in meetings, and again waking me up all night.

I do not want to turn the phone off. The alarm doesn't work that way, obviously.

I really hope I can get some help here. I'm exhausted!