The mother of a Canberra boy allegedly murdered by his father has slammed ACT authorities for ignoring her family's pleas for help.

Nine-year-old Bradyn Dillon died in hospital in February and his father Graham Stuart Dillon has been charged with his murder.

Dillon has pleaded not guilty to all charges.

Rachel Jones has called for tougher scrutiny over ACT child protection services. ( ABC News: Greg Nelson )

In an ABC News Canberra TV special, Rachel Jones spoke for the first time about the lengths she and her family went to to get help for her son.

Ms Jones said she spent the past three years trying to fight her way through a system that ignored her.

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"I spoke with the police, with child ... protection. Every card that was offered to me, I rang them on a daily basis, on a weekly basis. I was going into the police station," Ms Jones said.

"I was ridiculed, I was mocked. They made me feel like I had problems or I was trying to make problems.

Nine-year-old Bradyn Dillon died in hospital in February. ( Supplied )

"It makes you lose your faith in humanity after a while."

Bradyn's school, neighbours and other family members also attempted to flag their concerns with child protection authorities.

"I pray this doesn't happen to another family," Ms Jones said.

"But unfortunately I think the problem's too deep. That it lays within the Government and it's not going to change. It just seems to be happening on a weekly basis these days.

"I've lost a part of myself. I've lost faith in humanity.

"I fail to see the sunshine anymore. I just wish we'd been listened to before so I could have my little boy back in my arms."

ACT Children's Commissioner 'dangerously overworked'

In the ACT, there are two oversight bodies designed to help pick up on irregularities, mistakes and hear complaints regarding children at risk.

But current ACT Public Advocate and Children's Commissioner Jodie Griffiths-Cook said it was common knowledge her office was dangerously overworked.

"I think there needs to be an immediate review of the resourcing that's provided to my office for those oversight functions," Ms Griffiths-Cook said.

Following Bradyn's death, the ACT Government launched a major review of its responses to family violence, known as the Glanfield Inquiry.

Ms Griffiths-Cook said the inquiry was just the latest in a series of inquiries to recommend adequate funding for the Public Advocate and Human Rights Commission.

"It was one of the clear recommendations of that report and pointed to a number of issues within the system. The need to adequately resource our oversight functions being one of those," she said.

Ms Griffiths-Cook said "1,200 children and young people were brought to the attention of my office in the past year".

"That's a 40 per cent increase on the previous year," she said.

"I'm not sure whether the public realises how little resourcing the office receives to do its job."

Minister for Children 'unaware' of the issue

ACT Minister for Children and Young People Chris Bourke said he was unaware of the issue.

"This is not information that's been provided to me, that I've been able to act on since I became Minister," he said.

"At the end of the day you've got to be able to work with the information provided to you and the advice that is provided to you.

"I'll be going back and getting some more information and asking questions. Because that is the fundamental role of a Minister ... to ask questions. So I will be asking questions."

Bradyn's father Graham Stuart Dillon has been charged with his murder. ( Supplied )

But Ms Griffiths-Cook and her predecessors told the ABC they had been warning the Government for years.

"I think given the numbers alone I would hope the Minister was certainly aware of the number of children and young people who are being brought to the attention of my office," she said.

"Those figures are publicly available. We receive that information, the information on many of those children and young people directly from the department itself.

"We need to be asking the question about why children and young people, particularly those who are most vulnerable, why their rights are not being considered seriously enough to provide sufficient resourcing into this area.

"Why would we wait when the risk is that another tragedy like the one that prompted the Glanfield report could well occur in the meantime?"