Three months ago, Fardin Rahmani had a "beautiful" life in Australia, after spending six years as an interpreter for Australian forces in Afghanistan.

After the fall of Kabul in August, his nights have been sleepless.

"Since the country was taken over, my mum is always … in my dreams. When I sleep, all I'll see is the Taliban killing my brother," Mr Rahmani told 7.30. 

"I had a beautiful life. I was going to work, coming home, playing with my kids, taking [them] to the parks. Sleeping tight."

The father of three said he called his family every few hours to check that they're still alive and in hiding.

He has applied multiple times for humanitarian visas for his family members who are still stuck in Afghanistan, but said he has not heard anything back.

"Some of us got killed. Some of us got hurt in the battlefield. So we deserve something."

Mr Rahmani said he feels guilty that his work with the Australian army put his family at risk, and now he is powerless to help.

"I feel ashamed, like I did something wrong. [I] put this family in danger," he said.

"They were a simple family, living a quiet, good life. But now look at them … look at the situation now."

Fears Taliban will not show mercy

The Australian government has so far allocated 3,000 places within its humanitarian intake for this financial year, but more than 100,000 Afghans are estimated to have applied for the visa program since the Taliban took control.

However, even the lucky ones who hold Australian permanent visas are struggling to get to safety. 

ABC's 7.30 spoke to one former engineer who worked with Australian forces. He was one of the thousands who desperately tried to reach the airport in August. The ABC cannot identify him for safety reasons. 

"I sent lots of emails to Australian officials, to senators, any organisation that I found in Google to help me, but since August up to [now], I didn't receive any kind of help from anyone," he told 7.30. 

In a statement to the ABC, a government spokesperson said they were unable to give detailed information about the situation, but those with links to Australia would be prioritised.

During his attempts to reach the airport in August, he and his family spent two nights in the sewer canal, before being "lashed" by the Taliban. 

"I faced a huge crowd of people … suddenly I saw that a Taliban member came to me and start lashing [people]," he said. 

"I was totally stuck in the crowd. 

"My mother, she was injured underneath … I really [thought] that my kids or my mother, they will be dying [in] this crowd."

The man and his family have received Australian permanent visas through the locally engaged employee (LEE) program, but have had to change their hiding location seven times to keep themselves safe from the Taliban.

He said his family had split into three groups to scatter themselves across Afghanistan.

"The Australian government, the Australian people, cannot forget the Afghan LEE team," he said. 

"Because, in tough situations, facing lots of threats, we [helped] the Australian mission. We did our best.

'I love Australia. What do I say now?'

The government's promise to help never came for one former interpreter for the Australian Defence Force, who was murdered by the Taliban last month.

As his wife and children remain in Afghanistan, the ABC has chosen not to reveal his identity.

His sister in Australia had made desperate attempts to secure visas for their loved ones in the months prior.

The family applied for a humanitarian visa on August 26 and followed up with the Immigration Department on several occasions to try to expedite the visa process but received no response. 

"I always say to my family, I love Australia. What do I say now?" she said.

"This beautiful country, [these] beautiful people, this … government never [helped] us."

The family's lawyer, Shahri Rafi, said Australia did not meet its moral obligation to rescue the interpreter. 

She said the government was moving too slowly in helping Afghans, and needed to rescue visa holders and urgently increase the humanitarian visa intake for Afghans.

More than a week after the interpreter died, his wife and children were assisted by the Australian government, and taken to a US safe house.

They're now waiting for emergency visas and an evacuation flight, although a timeframe has not been provided to the family.

A government spokesperson told the ABC that they were "unable to give detailed information related to the situation at this time, including information related to arrival times and locations, visa grants or information about specific individuals".

The interpreter's sister said she would be more relieved when the family were out of the country.

"I'm still fearful for them," she said.

Watch this story on 7.30 tonight on ABC TV and iview.