More frustration has come from Auckland businesses affected by construction of City Rail Link.

It comes after the organisation admitted the disruption to businesses had been underestimated.

City Rail Link Limited CEO Sean Sweeney says comparisons were made with road projects in the country side or through suburbs, not in the middle of a major city.

Heart of the City chief executive Viv Beck told Mike Hosking it's been difficult for the businesses.

She says there's been no independent dispute resolution - so they have nowhere to go with issues.

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