LG microwave rusting

I bought a Microwave from Makro less than 2 years ago and now it's rusting. I have been using 2 other LG microwaves for over 6 years without any issue so the "new" one clearly has a quality issue that you are not willing to do anything about. This is a big mirror grill version....not a cheap one. The salesmen at Makro re-assured me I could return it if there are any issues. The returns dept at Makro said they would respray if there's rust but now that it's happened non one is willing to help. Makro says they wont do anything and LG says they wont repair either. According to LG website " Product warranty means that the manufacture or seller make a promise for the free repair warranty with the customer in case of the faulty of quality, performance and function in using the product normally." There is clearly a quality issue with this one. I've been using 2 other LG microwaves without any issue for 6 years and they don't have any rust. Very disappointed that my "new" one is rusting and furthermore Makro wont honour their warrantee. I've complained directly to LG with no response yet.