Ackermans town center the worst customer service ever

I went in to ackermans town center and look for a denim there was size 4-5 and 5-6 the 4-5 had no price but the 5-6 had one of 129.95 and i went to buy the 4-5and they told me its R159.95 and i said cant be cause the 5-6state its R129.95 its the same denim they told me its winter and summer stock and price different and 4-5 is 30 rand more and i ask how could that be i smaller size can't be more expensive then a bigger size there was like 3 people telling me stories they called the manger he didn even speak to me just agree that's its summer and winter stock and price different but its the same jeans and when i bought the big size 5-6 for 129.95 got home and see the slip shows its a black denim but its i blue one there is no customer service in that store no one assist a person on the floor all staff is at the till point and price you see is the price you pay they come up with all the stories yet no sorry and they still tell me someone put the price there .please im a customer at that stores many years everymonth i shopping there they have no customer service i need to understand how is the small size more expensive then there bigger size i have pics of everything