Can't turn off motion sound in IOS App

- I can't turn the sound off for motion. I have deleted the app, turned the phone off and on and reinstalled the app at least twice. I go through the process of device, front door, device settings, alert settings, app alert tone. Once there, I cannot change anything. if I select silent it goes straight back to windchimes. If I turn the volume down, it goes straight back to where it was. It's like a rubber band just bouncing back. The notice at the bottom says, "Your sound could not be loaded." I was on the phone with customer service for over an hour trying to fix this.