NEW DELHI/BENGALURU (Reuters) - As the coronavirus pandemic pushes India into a lockdown, the call centres and IT services firms that function as the world's back office are struggling to piece together work-from-home solutions and other business-continuity plans. Prime Minister Narendra Modi on Tuesday ordered 1.3 billion Indians to stay at home for 21 days to stem the spread of SARS-CoV-2, following earlier lockdown orders in many Indian cities and states. As of Tuesday, India had reported over 500 cases of the virus and nine deaths.