The Commerce Commission has stepped into a FoodStuffs investigation, after a pricing blip saw 70 North Island supermarkets overcharge customers this week, NZ Herald reports. FoodStuffs says it is investigating the technical issue that occurred on Tuesday between 7am and 12.30pm at Pak n’ Save, New World and Four Square stores. Meanwhile, the supermarket giant is yet to confirm how many customers were affected, or how much they were collectively overcharged.