How to report a contact as spam in Whatsapp? I received a message from a new phone number about some advertising information. When I opened the message I saw "Report Spam" option to report the spam to whatsapp. However once I replied to that message to not to send anymore ads to me, the option for reporting that contact as spam is not visible.

In the menu there is an option to block that contact. However, I feel that blocking a contact is personal choice of an user of whatsapp. And blocking the contact is different from reporting the contact as a spammer right? Or Does the "Block" and "Report Spam" option does the same job?

I haven't added that contact in my phone yet. But I want to report that number as spam to whatsapp. Now that Report Spam option is gone, Is there any method to report a contact as spam even after replying to that contact?
Try this:

Don't save the contact and delete the conversation. If the contact messages you again, the option to report as spam and block should technically show up again.