With a price-tag of R4-billion, the controversial home affairs identification system upgrade is costing more than twice as much as initially expected.
MPs are now turning to the Auditor General for help.
The National Assembly's portfolio committee on home affairs on Tuesday expressed serious concern that the cost had escalated from R1,9-billion to R4-illion.
Members were also unhappy that the head of the State Information Technology Agency (Sita) recently left his job in a huff without providing MPs with more information on whether regulations were followed in the awarding of the four contracts for modernising the identification system.
The Department of Home Affairs awarded the contracts to the Gijima AST consortium, New Dawn, Valor IT and Ideco Group.
The then Sita chief executive officer Llewellyn Jones apparently told the portfolio committee that regulations were flouted in the issuing of the tenders.
MPs wanted Jones to help them probe the matter further but he resigned abruptly last month.
At Tuesday's meeting, MPs resolved to meet Terrence Nombembe's office to provide the Auditor-General with more information regarding the portfolio committee's suspicion of possible corruption.
Committee Chairperson Patrick Chauke said the sudden resignation of Jones - amid allegations that he had clashed with deputy chairperson of the Sita tender board Michelle Williams - had left them in limbo.
At the closed meeting with Chauke's committee, Jones is understood to have reiterated his suspicions that procedures were not followed. But Jones' officials differed and told MPs and Home Affairs Minister Nosiviwe Mapisa-Nqakula that there was nothing untoward.
Besides the huge increase in costs, Chauke said the committee was also worried by the fact that Sita had also not given the committee the signed agreement it has with Home Affairs.
ANC MP Piet Matebe said given the fact that Jones was now gone, it would be appropriate for the committee to handle the matter with Nombembe's officials.
"We were awaiting further clarifications from the CEO (Jones) and suddenly he resigned. It's better to communicate with the office of Auditor-General and request a meeting," said Matebe.
The Democratic Alliance agreed.
"We met (Sita) on June 18 (where Jones) made a number of undertakings to gather some information and he subsequently resigned.
"There are a number of serious matters.
"I am concerned, I am unhappy, I am uncomfortable (that) you get all sorts of different answers when you seek information about tenders, about how they've done certain things and their relationship with Home Affairs," said DA MP Mark Lowe.
The controversy around the contracts has included a spat with Public Service and Administration Minister Geraldine Fraser-Moleketi who initially refused to let Sita account to the committee, saying that as the executive authority she was the most appropriate person to brief them on the processes followed.