Rusting Miele freezer door.

I purchased a Miele fridge and freezer for over R40,000 in November 2021. The fridge is perfectly fine, but the freezer door is rusting badly on the outside. There is obviously a factory fault with the protective coating because I am based in Pretoria and have not used strong or abrasive chemicals to clean the door. The warranty has subsequently lapsed, and Miele have offered to give me 30% discount on a new door which will cost me R18,000 after the discount. I can buy a new freezer for that price. I believe that this is terrible service for such a "premium" product, and would not recommend Miele to anyone.