A complaint against Whakatane-based Te Whare Wananga o Awanuiarangi may be taken to the Serious Fraud Office.
Last month Awanuiarangi was accused of breaking the law and deceiving its students by calling itself a university.
Ngapuhi leader David Rankin raised concerns over the wananga using the words "indigenous university" when it wasn't a university.
He wrote two letters to Tertiary Education Minister Steven Joyce expressing his concern and wasn't satisfied with the response.
"If there's no clear rectification of this matter by the end of July, I'll pursue it through the Serious Fraud Office," Mr Rankin said.