You are correct Nick, it drove me mad. Mine was solved by fitting winter wheels and tyres (at MB expense) which I received by going to the motoring ombudsman, no other solution at the moment.
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.