billing error foreigners Korea health insurance bill Korea local office notices foreigners Korea foreign resident bills Korea bank account Korea foreigner healthcare Korea dependent insurance Korea job loss mistakes Korea foreigner local office foreigners Korea address registration foreigner Korea foreign resident tax Korea foreign resident fine korea address registration risk Korea NHIS Korea foreign residents Korean bank account national health insurance korea foreigners foreign resident Korea insurance after unemployment Korea mobile banking Korea address reporting korea foreigner HiKorea address report housing problems after job loss Korea foreign resident bills korea overpay insurance utilities korea fix billing health insurance foreigners korea ARC bank account Korea expat tax risk Korea moving in Korea address change Korea ARC address change living in Korea