3rd. Try - Constant annoying "Cha-Ching" sounds!!

Have a Note 4 that constantly annoys me with repeated "Cha-Ching" sounds, have tried everything to find its source including blocking all app notifications. It does this sound everywhere even when Data and WiFi are off or on. In my previous two tries asking for help, one said it could be the Messenger Alert, the second suggestion was to turn off the NFC, neither stopped this continuous relentless "Cha-Ching" sound. However, today when I entered a local McDonald's it completely stopped till I exited that facility, how come? Does McDonald's WiFi use some special filtering/suppressing techniques. Please HELP, any suggestions or software fixes will be most appreciated. Thank you

Have you tried to boot your phone to safe mode? To try if any app is making the cha-ching noise on your phone? And is your location/GPS on or off?

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This might not be helpful..... But the ebay app has the "cha-ching" notification...