Hi andiruleu,
Unfortunately, none of captcha plugins can guarantee 100% spam protection. We could advise you to increase captcha complexity level on the settings page.
1) You may receive spam from the forms where captcha is absent.
2) Please check if captcha works and blocks submission if entered incorrectly.
3) We suggest you increase captcha complexity on the Settings page and update to the latest version, if you have not done so yet.
4) Maybe you will be interested in our Limit Attempts plugin (http://wordpress.org/plugins/limit-attempts/) – With this plugin, you can limit user’s attempts to log in to your website and, consequently, block the user for a certain period of time.
Regards,
BestWebSoft Support Team
