Help! I am constantly getting Firefox promotional emails

I signed up for a Firefox account and everyday I am getting at least 1 mail from Firefox. I have clicked on "Unsubscribe" link and even checked the last checkbox to unsubscribe from everything. It does say that it might take a week for the setting to take effect. It's been almost a week. And I am still getting mails.

Has anyone faced similar issue? Could you resolve it?