Why won't wifi stay off?

[CEStanley]

My phone keeps turning WiFi on and connecting when I turned it off. Is there a setting I'm missing to make it honor my choice?

 

[CEStanley]

On my S5, if I turn off WiFi and restart my S5, the WiFi stays off.

 

[anuj3212]

Turn off the phone.
Once the phone has completely shut down, press and hold Volume, Home, and Power buttons at the same time.
Wait until the Samsung logo appears before releasing the Power button.
Once the Android logo shows up, release the two other buttons.
Wait for the Recovery menu to appear (may take up to a minute).
Go to wipe cache partition option using the Volume buttons, then press Power button to confirm.
Wait for the device to wipe the cache partition
Once the cache has been deleted, Reboot system now option will then be highlighted.
Press Power button again to confirm the reboot.