Mr Carter said he had referred the matter to the Privileges Committee to investigate.
Because of that action, Mr Cunliffe said he was unable to provide details, including on what actions Maritime NZ was alleged to have taken against Wind.
A spokesman for Maritime NZ issued a one line statement, saying the organisation, "strongly rejects the allegations made and will fully cooperate with the Privileges Committee inquiry".
Maritime Management Services has been contacted for comment.
In her April 27 written submission to the select committee, Wind said Maritime NZ had failed the sector by "grossly overcharging".
"Maritime NZ's aggressive approach and abuse of privilege has led to a reduction of an estimated 20 per cent of domestic operators - and an over 60 per cent reduction in surveyors within eight months," Wind wrote.
Parliamentary Practice in New Zealand states that the House is concerned to "protect witnesses against any adverse consequences being visited on them as a result of their giving evidence to the House or a committee".