"The delays have created their own sort of stress, and our clients often don't have good health, so we've had clients who have died while they've waited for their records."
It had taken anywhere between seven to 16 months to get records in some cases, she said.
A lawsuit was lodged with the Human Rights Review Tribunal in April.
The delays "feel like a secondary type of abuse", for many of the claimants, Ms Hill said, "where the same organisation that abused them as children is now treating this request for records with a degree of contempt".
The law firm had 99 other outstanding requests for records, some made almost a year ago, Ms Hill said.
The Ministry of Social Development refused to comment to Radio New Zealand while the case was before the tribunal, it reported.