How do you contact a human behind iTunesConnect?
Assuming you're a registered Developer, you can just call the Apple Developer Program Support number for your country. 

The direct link is: https://developer.apple.com/contact/phone/

If you wanted to know how to navigate to this, you would just:


Login at https://developer.apple.com
Select Support in the main menu
Scroll down to and select Contact Us
Scroll down to the Enrollment and Account subheading
Click on Apple Developer Program Support
This will open a Contact Us form
Above your details you'll see a link for call us