Centrelink call times are being congested by automated redial apps preventing real callers from getting through to the service.
The apps were used almost 250,000 times in 2016-17, with the top 500 unique phone numbers generating 685,000 busy signals, Perth Now reported.
Human Services Minister Michael Keenan released the figures, revealing auto redial apps constitute 20 per cent of calls, or 11 million of the 55 million busy signals met by customers each year.
Centrelink call times are being congested by automated redial apps preventing real callers from getting through to the service
Human Services Minister Michael Keenan (pictured) says the app is unfair to the vulnerable
The figures also show one mobile phone using the automated redial app,rang the Department of Human Services call centre 4500 times over a 12-month period, successfully getting through 300 times in the same period.
'These callers are clogging up the department's phone lines,' Mr Keenan said.
'They're disadvantaging the most vulnerable in our community from accessing the services they need.'
The Department of Human Services call centre is the biggest in the