I recently did some work for a client who only paid half of the original agreed upon amount for the work done.

Now I can't get the money (R3000) out of him, he doesn't answer my calls or emails, or return voice mails / messages left at receptionist.

So, what do I do to get the money? I'm thinking I should just blacklist him - I'm tired of people who think they can walk all over me. BUT, what's the correct ways in doing this, if this is the only way I can (possibly?) get the money from the client?

Or, what other steps can I take?