Builders Warehouse/express *********** customers

I understand there was a price adjustment with the VAT increase. But I don't understand is how a 5x Pack of 1mm BlackSmith grinding Disks can go from a R60 price tag to a R96 price tag?? At your express store in Walmer I was told there is a issue with the price and was given it at R60. But now at Walker drive store I was told there is nothing wrong with the prices.. How do you justify a R36 price increase? Which leaves them at R19.20 a disk?