pjcwashere on "[Plugin: Contact Form 7] Spam via Contact 7 but not my forms!"

I'm getting spam sent via Contact 7. It is using a default form of which none exist on my site. I use Captcha and Aksimet and they work on the forms I created. But spammers seem to be exploiting Contact 7 and sending several rubbish text email at a time using what looks like the bare minimum fields required. How do I stop this!? If I can't I'll need to remove Contact 7. Help.

http://wordpress.org/extend/plugins/contact-form-7/