The chief executive of Transfield Services - Australia's offshore detention centre management company - says advocacy groups should be able to lobby against offshore detention of asylum seekers.

But Transfield chief Graeme Hunt says groups like GetUp and No Business In Abuse (NBIA) should take their concerns to the Federal Government, and not slam innocent companies contracted to enact the policy.

“I would absolutely support Getup and NBIA in the context of their right to lobby to change the offshore processing policy — that is everybody's right,” he said.

“But the policy is what the policy is at this point in time, and we are contracted to a Federal Government department to provide services, and we do the best possible job we can in those circumstances.”

“We do the best possible job in very difficult circumstances.”

Social activist groups are lobbying Transfield investors in an effort to shine a light on the widespread and well-documented human rights abuses occurring at centres on Nauru and Manus Island under Transfield's watch.

“No company in today's day and age can knowingly be part of a system that abuses people in this way,” NBIA executive director Shen Narayanasamy told the ABC.

Mr Hunt defended Transfield’s transparency, saying the Border Force Act did not stop staff from raising concerns about abuse.

“Our employees can speak both directly to the company, directly to the authorities, but we also operate an independent whistleblower hotline,” he said.

“There is no issue or problem with people raising concerns if they have them, and what we do through our processes is encourage all of our staff to be absolutely transparent and to raise concerns.

“Our company is absolutely committed to transparency.”

In other news, Transfield may soon be known by a different name.