Public Protector says she doesn't have the resources to pursue an investigation.
Thuli Madonsela says the inquiry must continue the work of the Public Protector's office.
Transnet has taken media reports based on the recent #GuptaLeaks very seriously, and that investigations were underway, MPs heard on Tuesday.
"A company needs to understand that it is not so much about what they need to say, but what the public needs to hear."
Could the multinational face the same public wrath as McKinsey, SAP and KPMG?
Three more instances of apparent money laundering involving the Guptas have been discovered, while KPMG was auditing the firms involved.
The questionable payment of R25m to the Guptas' controversial ANN7 channel by MultiChoice, which owns DStv and M-Net, was discovered among the #GuptaLeaks emails.
MultiChoice, the pay-TV company that owns DStv and M-Net, made a questionable payment of R25-million to the Guptas' controversial ANN7 channel.
McKinsey said it would pay back the R1-billion it was paid by Eskom.
The global banking giant says it has "closed a number of accounts for associated front companies wherever we have found them".