The Department of Human Services is resisting calls to restore staff oversight to its controversial debt collection program, saying Centrelink clients need to give the correct information.

After critics of the program blamed its problems on staff cuts removing people from the debt raising process, the DHS told a Senate inquiry on Tuesday that clients needed to provide the right data to avoid inaccurate debt notices.

​​The Department of Human Services, which oversees Centrelink, has spent $32,249 on Cellebrite products in the 2016 / 2017 financial year. Credit:Bradley Kanaris

Department general manager of integrity modernisation Jason McNamara said the recent Commonwealth Ombudsman report on the online compliance intervention program found it was "providing accurate debt outcomes".

"I don't accept that there's staff cuts in the area, very much the opposite in compliance," he said.