Yeah I know, it was a plan for me too. Not sure what else to do. Mine is still working even though it is not on is own line, just when the phone is on. But I thought the phone has to be on for the watch to pick up the call.
Have you tried pressing and holding on the icon and selecting app info and then down to notifications and turn off there. This has worked for me with other apps. Good luck!
Had mine sine it came out and no issues with it what so ever! Been with the Note series since 4 and the 8 is just great! Really loved my 5 though but the 8 is just as good! Just my 2 cents.