If you're using the 8.1 version,then you can delete the contact permanently.
First Block the contact,then delete him.The contact will appear in the 'non-instant messaging' group after this.Then delete the contact from that group.
If you're using the 8.1 version,then you can delete the contact permanently.
First Block the contact,then delete him.The contact will appear in the 'non-instant messaging' group after this.Then delete the contact from that group.