Spam problem

Hello,

I have a big Spam problem. I already use Akismet, Better WP Security and Bad Behavior to try and prevent spam as much as I can BUT this one person keeps spamming my website – A LOT.

His ‘comments’ come from one blog post of mine and from no other. His IP is also always the same. I have received 100 spam messages from him
in the last 48h. Have a look at the link below to see a screenshot of the comment section on my blog

The name and email address that he put in the comment fields vary but it seems that most of the times he use either Clicky or Happy.

Screenshot of WP Comment Section

Things i`ve tried so far:
– Put his IP in the Ban User section of Better WP Security
– Manually insert his IP in the .htaccess file.

Any help is appreciated. This is really getting annoying. It has been going on for almost 2 weeks now.