The last refugee left in Australia's $55 million resettlement program in Cambodia has been told he will soon be cut off from Australian-funded assistance.

Key points: Refugee support services are only meant to last for 12 months

Refugee support services are only meant to last for 12 months Four others in the resettlement program returned to the countries they fled

Four others in the resettlement program returned to the countries they fled Mr Roshid is sick and frustrated by the poor medical treatment he receives

Mohammed Roshid says he has been left sick, isolated and despairing about the future.

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Australia pledged $15.5 million to help resettle refugees in Cambodia and has already paid about $2.5 million to the International Organisation for Migration (IOM).

The funds paid to IOM are in addition to Australia's pledge of $40 million in development aid to Cambodia in order to secure the resettlement deal.

But the support services are only meant to last for 12 months.

"They contract for me one year [and it's] just finished six to seven months now," said Mohammed Roshid, 26.

"After, I don't know [whether] they help me [or] they do not help me — they already tell they do not help for me," he told the ABC in Phnom Penh.

IOM declined to discuss Mr Roshid's case, citing privacy reasons, but released a statement about the general arrangements in Cambodia.

"IOM will assess the individual circumstances of each refugee and make a case-by-case determination on whether settlement support services should continue after one year," said an emailed statement.

Last man standing

Mr Roshid is the last refugee still in the resettlement program, after three Iranians and a Myanmar man decided to go back to the countries they fled.

Mr Roshid said goodbye to the other remaining refugee, an Iranian man named Daniel, a few weeks ago.

Then-Immigration Minister Scott Morrison toasts the Cambodian refugee deal in Phnom Penh ( Getty Images: Omar Havana )

"When he gone I have a feeling it's no good … but he didn't like [Cambodia], it's not safe for them," said Mr Roshid.

He said unlike the other refugees who gave Cambodia a try, he was stateless and could not return home.

"Wherever you want to go you can go, but I cannot go. I don't have, in my country, I don't have citizen(ship)," he said.

Mr Roshid is a Rohingya Muslim, which is an ethnic group the Myanmar Government does not officially recognise.

More than 120,000 Rohingyas are kept in camps in western Myanmar, and subjected to apartheid-like policies that restrict their movement and who they can marry.

Mr Roshid had hoped life would be better in Cambodia, but he said he was sick and frustrated by the poor medical treatment he receives at the local hospital arranged by IOM.

He spent several months sleeping in the IOM office but now rents a room out of town for $70 a month.

He currently gets an allowance and has access to a range of resettlement services provided by IOM.

"Services provided will depend on the individual's particular need, but primarily include medical, counselling, employment services, accommodation and language training," said the IOM statement.

The Australian Government told the ABC about $2.5 million had been paid to IOM so far.

But there could be more soon, with reports in the Cambodian media of two Iranian refugees on Nauru considering resettlement in Phnom Penh.