The company had criticised the regulator's audit when it was published last week and issued a line-by-line rebuttal of the audit, pointing out what it claimed were numerous mistakes and incorrect assumptions being made.
There is dispute as to whether fees should be liable on revenues invoiced, but not collected, and whether previous payments made to the regulator were counted correctly.
The company added that it would appear that the auditor has taken voice and SMS traffic data from two months worth of records and then extrapolated that backwards for 14 years.
According to the audit, the mobile network will have to pay the outstanding amount by October 23, otherwise the regulator might take legal action.
Theoretically, the regulator could block the renewal process for the company's GSM license during the legal process.
The company's Chairman, Sigve Brekke did however suggest that the company would be willing to make a payment if an independent international audit firm found any discrepancies.
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