Follow The Steps -:
1) Download Bluestacks in your pc
2) Now Install It And Open, Signup Your Bluestacks Account.
3) Download Whatsapp Plus Mod.Apk And Install It. [important]
4) Now Create New Whatsapp Account With New Mobile Number .
5) Add The Person {Person You Want to close the whatsapp}
6) Now Refresh Your whatsapp contacts, and add the victim in whatsapp.
7) Create New Message With 3000 smileys in whatsapp and send it.
8) Now victim whatsapp will crashed successfully,
9) when he trying to open his whatsapp, It Says Unfortunately Whatsapp Has Stopped.
Don't Forget To Give A Beautiful Comment!!