Need to block a user from site

Job ID: 32769838

Budget: $10 – $30 USD

I have a website that someone is continuosly clicking on ads, etc. I need them blocked from my site.
I tried blocking using .htaccess but that doesn't seem to work.
CSF is installed on site, so you should be familiar with that.

Attached is a clip from the web server log files today, Im sure it is the same person.
Related categories: PHP Linux Web Security Apache HTML