You can stop receiving messages, calls, and status updates from someone by blocking them.
When you block someone, the existing chat will still appear in your chat list. You can choose to delete the chat entirely or archive it instead. If you want to start receiving messages from them again, you can unblock the sender.
Please note that you cannot block a group. However, you can exit the group and block the group admin.
You can also adjust your privacy settings to prevent unknown contacts from adding you to groups.
Click on the chat with the person you’d like to block.
Click Block User.
Click Unblock if you’d like to unblock the contact.
You can also click Delete chat > Archive or Delete.