The MP for Papua New Guinea's Manus Island says nothing has been done to return three Australians to face rape charges.
The three, who worked for a security contractor at the Australian-run asylum seeker detention centre, are accused of raping another employee.
Shortly after the alleged rape in July, the three were flown out of the country.
The PNG government says it asked the Australian government to extradite the men and Australia's then-prime minister, Tony Abbott, said his government was cooperating with its request.
But the Manus MP, Ronnie Knight, says the case appears to have been swept under the carpet.
"Well basically nothing has happened. The father and the relatives of the person who was raped, they were promised that within that week those people would be brought back for questioning and investigation and charging if there was something to be charged, and that one week was several months ago. It's disgusting."
Ronnie Knight says there has been little information from the government and the police about the case's progress.