Other methods that can be used to stop Whatsapp from connecting to theinternetcan be done with the help of Netquin Antivirus which you candownloadthat from www.netqin.com/en/antivirusand after downloading it just launchitand Put Whatsapp inuntrustedapplications list, don't forget to put thefirewallin On mode, That will help you to kill the applications.
Whenever you want Whatsapp to connect just open the Antivirus > Firewall > Settings >now setwhatsapp as trusted application.
Incase you still want to discontinue it again just go back to the settings and set it asuntrusted application.
If you also know another methods that can be used to stop Whatsapp from connecting to the internet all the time just submit it in thecomment form below.