Casac says it has seen evidence of decision making that shows Busisiwe Mkhwebane tried to protect officials.
Public Protector Busisiwe Mkhwebane announced a new probe into the role of politicians allegedly implicated in the Estina dairy farm scandal.
Masutha listed five cases, costing R 24,240,201.54.
After criticism of her investigation into the Estina dairy project in Free State, Busisiwe Mkhwebane is giving it another shot.
The DA has asked the Public Protector to investigate RDP contracts in the Free State awarded to a company in which the daughter of outgoing premier Ace Magashule owns a stake.
"The record includes documentary evidence and transcripts of meetings and interviews, among other things."
Public Protector Busisiwe Mkhwebane faced a grilling from MPs after being summoned to discuss criticism of her work, most notably the Vrede dairy farm report.
Busisiwe Mkhwebane says her reports are not soft, and that she is here to stay until 2023.
“When I became aware that senior Eskom officials deliberately misled me, I immediately informed Parliament’s Ethics Committee," she said.
The Public Protector has released her findings into allegations of a violation of the executive member's ethics code by Minister Lynne Brown.