Toobad is correct, I spent 12 months on this problem with MB UK, I had the hassle of going to the motoring ombudsman. In the end I was given a set of 20 inch wheels with winter tyres but ONLY as a gesture of goodwill.
Get the assurance of all weathers in writing BEFORE you accept the car.
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.