A spokesperson for G4S said the firm had not been provided with the results of the initial audit of the government electronic monitoring contracts with the government, despite requesting the report.
They said an internal investigation, with external help, found no dishonesty in the tagging contracts.
More top news
When Suray Mohamed left her village she was a wife and mother-of-seven - but just weeks later there is only her left.
The band split up 29 years ago and barely talked since.
Nazanin Zaghari-Ratcliffe was detained at Tehran Airport while visiting family in Iran with her baby daughter, Gabriella, in April 2016.