Unable to uninstall mailchimp


I am trying to uninstall mailchimp from drupal system. I did google but I could not find the specific solution.

I did uninstall all the mail chimp components but on modules page, I see check box is disabled.
Deleted the mailchimp folder from file manager. Cleared the cache.
I still see mailchimp is disabled in admin/modules.

Installed mailchimp again.
Enabled mailchimp components. But mailchimp is still disabled in admin/modules.
Config page, i get this error:

Failed to load MailChimp PHP library. Please refer to the installation requirements.

Status report page, I get this error:

The MailChimp API library could not be found.

I got the API key from mailchimp and entered in mailchimp config page. I still get this error.

Please advise how i can remove mailchimp from system.

Drupal version: 

Source: https://www.drupal.org/taxonomy/term/22/feed