There are many ways to activate DND in Vodafone (vi). But here the easiest way is to activate DND on Vodafone number.
You can activate dnd by sending a message or from myvi website.
First go to myvi.in/dnd
Enter your mobile vi mobile number to activate DND. Click Send OTP.
OTP will be sent to your mobile. Check your mobile and enter OTP.
Choose Full dnd here and click submit.
After doing all this, DND will be activated on your mobile number in the next seven days.