Hello Laurensallal,
Thank you for using Apple Support Communities. It's my understanding that the Wi-Fi option isn't responding on your iPhone. I can definitely see how this could be frustrating. You've come to the right place! I'm happy to help.
If you haven't already, make sure that your iPhone has the latest software version.
Update your iPhone, iPad, or iPod touch
If the issue persists, restart your iPhone. Restarting can resolve many unexpected behaviors.
Restart your iPhone, iPad, or iPod touch
If you're still unable to turn on Wi-Fi, reset network settings. Tap Settings > General > Reset > Reset Network Settings. This will reset all settings, including Wi-Fi passwords, VPN, and APN settings.
Let us know the results. Please include specific error messages and any other troubleshooting steps you may have tried.
Have a nice day!