This method will also block incoming messages from the selected contact. There’s no way to disable calls without disabling messages.
If there’s no conversation with this person in the list, tap the New Chat icon—it’s the square with a pencil at the top-right corner of the screen—and then select the contact from the list.
Though there’s no way to turn off all incoming WhatsApp calls, you can ignore them by enabling Do Not Disturb mode on your iPhone or iPad. When your phone or tablet is in Do Not Disturb mode, you will not receive any notifications, vibrations, or lighting-up of the screen.
If you want, you can set a schedule for Do Not Disturb so that it automatically turns on and off at certain times. Slide the “Scheduled” switch to the On position, then select your desired days and times.
