The woman was home alone inside her Queenstown property when she had a medical emergency and was unable to get through to Triple Zero on Thursday.

Paramedics and police eventually arrived at the home but the woman could not be saved.

Since the tragedies, South Australian police have conducted welfare checks on more than 150 callers in the state.

Adelaide resident Chris Tyndall received a follow-up call after he spent Thursday morning repeatedly trying to call for an ambulance with two phones.

The 70-year-old, who lives with heart disease and diabetes, had spent a week in bed with the flu.

“I was struggling,” Tyndall said.

“When they got here, I went to open the door and nearly fell, that’s when she knew something was dreadfully wrong.

“She took my blood pressure standing up and it dropped dramatically.

“She said that could cause a stroke.”

“South Australian police didn’t know. No one in SAS or ambulance service knew; my office didn’t know. But then they conducted a press conference,” said Malinauskas.

“I have not witnessed such incompetence from an Australian corporation in respect to communications worse than this.”

Western Australia’s Premier, Roger Cook, also spoke out against the telco, deeming the outage “completely unacceptable”.

Optus said a botched firewall upgrade was to blame for the failure of Triple Zero calls.

The outage stretched on for 13 hours and impacted about 600 emergency services calls across South Australia, Western Australia and the Northern Territory.

Two complaints have since been raised with the Telecommunications Industry Ombudsman.