Can I completely turn off mobile data on my Xperia GX?

[AC Question]

I have flashed android marshmallow for my xperia GX, but at one condition if Wi-Fi is turned off, cellular data will enabled automatically. There's option in Developer Settings which "Wi-Fi Agressive...", and it is off. When I turn off cellular data, it will be turn on again automatically. So, what can i do for disable automated turn on cellular data?