rusted screws in engine compartment quality from BMW

My Mini Diesel BJ 2008 with 40 000 km, well-kept carport car has totally rusted screws in the engine compartment. I am totally scared when I saw this. BMW rejects warranty because only the “look” has changed! In an accident with a polo the so-called bumper split up like a yoghurt cup in the back. At the polo there was nothing to see. Attention with mini-buy! That was my last car vin BMW-Group. I am sick of it!