''Found in app by Siri''

Why can't I turn Siri completely off? When I search for a contact in contacts, it shows random people listed by ''Found in apps by Siri''. Apparently she finds them through my messenger, facebook and even my email.

I tuned every single Siri-related settings off, and even in apps too. Why does she still suggest people i don't event know. Like, why do I need some number on a random support guy from my email?

Even more scary.. does people get my personal information too?

Please tell me u got a fix for this.