Hosting my own forms with captcha in Mailchimp

I really have been struggling with finding the answers to this question.

I have embeded a form with Mailchimp inside my own website, the form has all the fields I pulled from the source of the default mailchimp sign-up form except the captcha section as my domain is different of that of Mailchimp.

The problem is that every time I want to submit the form it is redirected to the mailchimp form via the action:

<form action="http://ift.tt/1F6YoHi" method="post">

and once it gets there it forces me to do redo the captcha because it throws an error.

How do I keep the entire form submission process within my own website and only use the form fields and submission directly to Mailchimp's database without having to go via their default form?