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