Hi Jacobofeijoo,
Unfortunately, none of the captcha plugins guarantee 100% spam security.
1) Spam may come from the forms without captcha – please check your site and all the forms on it.
2) Please check if captcha works and blocks submission if entered incorrectly.
3) We can recommend you to increase captcha complexity on the settings page and update to the recent version if you haven’t done it yet.
4) Maybe our plugin Limit Attempts (https://www.ads-software.com/plugins/limit-attempts/) will help – 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