Disable Phone Functionality in Apple Watch

I want to disable all notifications like phone calls, SMS and so on.

I have tried to disable call/message notifications in My apple Watch.

I have disable this in my Apple Watch -> Phone -> Custom (instead of Mirror my Phone) -> Show Alerts -> disabled But when I get a phone call my watch still alerts me without ringtone. How to disable this?

Unfortunately, there’s no option to completely disable incoming phone calls on my Apple Watch.

Could you help me with this, please ? 

Thank you

Mayunathan