A COSATU-affiliated union wants Communications Minister Siphiwe Nyanda to set up a commission of inquiry into alleged corruption by Vodacom's former chief executive Alan Knott-Craig.

Knott-Craig allegedly used the company to channel millions of rands into family businesses.

The Sunday Times alleged that Vodacom is sitting on a KPMG forensic audit report that shows that Knott-Craig's son reportedly received office space and millions of rands to grow his company.

It also reported that "a company owned by his niece and nephew, and which was on the verge of bankruptcy, was awarded a multi-million three-year marketing and advertising contract without a proper tender process, and that Knott-Craig arranged for Vodacom to pay thousands of rands for a call centre employee to be trained as a magician".

The labour court has apparently issued a subpoena for the report to be made public.

Yesterday, Knott-Craig denied all allegations of corruption. He told Business Day that he was told that the KPMG report had exonerated him.

But the Communication Workers Union said they were "disgusted" by the allegations, and demanded that Nyanda immediately set up a commission of inquiry.

Nyanda's spokesperson Tiyani Rikhotso said the minister had not received any formal request from the union for a commission of inquiry.

"Let the request come and then the minister will apply his mind to it and take a decision after that," Rikhotso said.