The number of calls to Centrelink that hit a busy signal has ballooned out to nearly 29 million for 2015-16, up from 22 million the previous year.
"In addition call waiting times on the main program phone lines remains high causing further frustration.
“I have been tracking this growing problem for some time and every estimates the numbers seem to continually climb.
“It is clear the issues with the phone service for Centrelink has not been adequately fixed. Although the Department says it is trying to reduce the problem, there is only so much they can do on available funding.
“Whilst the Government likes to vilify people on income support, people are trying to do the right thing and to adjust earnings, and other details or trying to gain urgently needed support.
“I continually receive complaints of negative experiences from people that simply cannot get through. The Government clearly doesn’t understand the despair that some people are feeling when trying to interact with Centrelink and the Government's system.
"The accounts of experiences show people trying to do the right thing, trying to get support in difficult situations, and being failed by the system. The Government must address these flaws”.