Woolworths review: Overcharging for chicken after being told 2 days previously the price was incorrect

Two days ago I went thru self serve and realised the chicken drumsticks were charged at $4 a kilo. I just wanted to be charged the right price so I got them to do a price check. They came back after checking the price, got my chicken and took it away to get corrected. I then paid for it and headed home. Today, two days later I purchased 2 more kilos of chicken drumsticks and was charged again, the higher price. For two days this has been charging people nearly 25% more. Not just wasting my time but ripping everybody off. I did speak to the manager in the deli about this and was told that one of the scales is charging wrong and the regular staff know not to use these for drumsticks, I got a new girl but she would turn the scales off now so it can update and reboot. I then got given the difference in the amount I paid and the correct amount that should have been charged. I would just like to not waste my time, charge me right
And fix mistakes immediately, this is beyond acceptable.