"Just because you find employees leaving your business 'frustrating' does not entitle you to penalise them by withholding their last pay."
According to the Inspectorate, the company's director Rhonda Burridge would regularly alter employee timesheets to match supervisor records when there were conflicts - particularly when the supervisor recorded fewer hours.
Burridge was also found to have added in 45-minute unpaid lunch breaks, even when employees had recorded shorter breaks.
"Altering your employees' timesheets without their consent, as was common practice for Ms Burridge, is not acceptable," Finnegan said.
"Having accurate employment records is important for protecting employers and employees, both for ensuring all hours are paid for, and helping to avoid disputes," he said.
"New Zealand has a reputation as a fair and equitable country, and it's important this is maintained."
Finnegan said that for a country with such a big stake in exports, it was in the best interest of the viticulture industry to take active steps to make sure employment obligations were being met in vineyards.