Follow this simple step to block the user in whatsapp. Take help of iphone screenshot to apply the settings.
1) Go to seeting page on whatsapp.
2) Click on the “Account” tab.
3) Choose Privacy tab.
4) Select “Block” .
5) Now you are at the page where you can add or select the numbers from the contact list to block. Click to Add new to access the contact list.
6) Done.
The blocked contact number will not able to connect or chat with you on whatsapp. The whatsapp have stored your suggestion and the will obey your instruction.