Bad servace at DKNY Kollonade

Went to DKNY Clothing in Kollonade shoping centre , me and my fiancé was looking for a dress and we found a stunning white dress on the 50% of section , so we tried purchasing the dress and when the cashier rang up the dress it wass full price R1150.00 and we made her aware that this dress was on the 50% of section she told us we lied and that the dress was not on sale. Will never go back to DKNY THANX TO THE BAD EXPERIENCE