Don't want to receive messages from someone on WhatsApp? No worries, you can block that person.
Press the button, then choose Block New Contact to select a contact you wish to block.
If you wish to block an unknown number that has sent you a message, you can select the chat of the unknown number, press the button, and choose Block.
That's it! You will not receive any more messages from those blocked contacts. Learn more about what happens when you block someone in this article.
Learn how to block or unblock a contact on: Android | iPhone | Windows Phone | Nokia S40 | Nokia S60 | BlackBerry 10
Cheers,
WhatsApp Support Team