The Australian government said on Saturday that telecoms firm Optus “let Australians down” after three people died during a network outage that prevented calls to emergency services.The outage impacted 600 people across South Australia, Western Australia and the Northern Territory on Thursday evening for at least 10 hours.Authorities said they were not informed of the incident or deaths until late on Friday.Communications Minister Anika Wells said on Saturday the telecoms company had “let...