Hello,
Thanks for the topic.
1. Please provide us with your website URL and temporary wp-admin access so we can take a closer look.
2. I would recommend you to create footer as a static block, then you will be able to edit content of it using VC. Please read our documentation https://xstore.helpscoutdocs.com/article/48-widgets-custom-widget-areas https://xstore.helpscoutdocs.com/article/47-static-blocks
Footer demo blocks can be disabled in Theme Options > General > Footer.
Regards