The security contractor that ran Australia's Manus Island detention centre is confident it didn't abuse asylum seekers' human rights.
Human rights lawyers have filed a formal OECD complaint against former security contractor G4S, arguing it failed to meet international standards on Manus Island.
The Human Rights Law Centre said asylum seekers were kept in harsh conditions and denied basic medical care and hygiene.
A spokesman for G4S said the company was considering the details of the complaint.
"However, G4S is confident it has complied with all of its human rights and legal obligations," the spokesman said in a statement on Tuesday.
"It should be noted that the Human Rights Law Centre's complaints refer largely to the policy of offshore detention and to matters over which G4S had no direct control."
The complaint said G4S provided only a couple of days of "woefully inadequate" training to Papua New Guinea locals, who formed the majority of the guards at the centre.
An independent review of an outbreak of violence in February, which left one man dead and 77 others needing medical help, found some guards bashed escaped inmates.
Martin Appleby, a former G4S safety and security officer and training officer, said the standards on Manus Island would "never ever" be allowed in Australia.
"Not one (Australian) inmate would see the inside of Manus Island detention centre," Mr Appleby told reporters.
Keren Adams, a lawyer with Leigh Day, said the complaint would not bring a binding outcome, but it would affect G4S' ability to earn future government contracts within the OECD.
"G4S' contract to run Manus has ended but Transfield has stepped into its place and there is little indication that conditions at the centre have materially improved," Ms Adams said.
The complaint, made under the OECD Guidelines for Multinational Enterprises, has been submitted in Australia and the United Kingdom.
Ms Adams said similar OECD complaints had been successful in curbing other companies' behaviour in Europe.
She said she expected an outcome from the complaint process within a few months.
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