Stop/start comes on with the ignition unless the car has been stopped for less than 4 hours with it turned off. You cannot programme it to stay off, same on a lot of cars, just press off by command system knob. You can programme it as off in individual setting but still need to select that.
2017 GLC AMG43 premium plus, night pack, leather, intel lights, 360 camera, side steps. = sadly gone
Now GLE450 Premium plus, Selenite, Black/White Nappa leather, Tech plus pack, Driving assistance pack, Tow pack, Off road pack, 22 inch wheels.