Yeah there's nothing to worry about with voice control because it's not connecting to the Internet. Also the reason it called someone when you said hey siri is because voice control won't do anything if what you said didn't make sense to it, it'll just match up your words to whatever it closely sounded like.Thank you.
Voice control wasn´t disabled, but even after disabling i can still start voice control from the blocked screen.
It seems that this access cannot be blocked.
I have to leave you for some hours (I have to work a little bit) and will come back here again.