Two Pak'nSave supermarkets are facing millions of dollars in fines after admitting Fair Trading Act breaches

The Commerce Commission filed criminal charges against the Silverdale store in Auckland, and Mill St store in Hamilton in March, for allegedly engaging in misleading specials and inaccurate pricing.

Charges were also laid against Woolworths NZ - with each charge carrying a maximum 600-thousand dollar penalty.

The commission's confirmed both Pak'nSave stores admitted 11 charges earlier this month, and were remanded without plea on the other seven.

Consumer NZ Chief Executive Jon Duffy says it's a wake-up call for the industry.