Chorus announced yesterday that the Commission intended to further extend the timetable on the pricing review, with final decisions now due by December.
Hawkins said the pricing determination and the degree to which it was backdated were crucial for Chorus shareholders, who were receiving no dividends while the company struggled with reduced earnings.
"The Commerce Commission needs to get its act together as these repeated delays are prolonging the regulatory uncertainty and damaging the credibility of the New Zealand capital markets," he said.
A Chorus spokesman said it was disappointing to have yet another significant timetabling delay.
"We don't accept that our cross submission introduced substantial new information," he said.
"It is one issue of many in our cross-submission and we don't see it as a justification to delay the process further."
Chorus shares, which have gained 71 per cent in past 12 months, recently traded down 1c at $3.01.