Hey marwhardy!
I have a link that can help you with this issue:
VoiceOver basics - iPhone
http://help.apple.com/iphone/7/#/iph3e2e33be
Use the information in this link to navigate your phone using VoiceOver so that you can access the settings for VoiceOver and deactivate it. It’s possible that your VoiceOver function might also be controlled by the Accessibility Shortcut, and can be quickly turned off. Use this link to learn more about the Accessibility Shortcut:
Accessibility Shortcut - iPhone
http://help.apple.com/iphone/7/#/iph3e2e31a5
Take care, and thanks for visiting the Apple Support Communities.
-Braden