I-Jump entry denied because of different colour socks

My daughter has I-jump city socks that i bought when we visited Gold Reef City about 2 years ago, with those dame docks we visited i-jump Secunda an she was denied entry because they claim that they only allow yellow i-jump socks at Secunda and not the orange ones, we were forced to buy the yellow ones to gain entry. Why is Secunda i-jump not informed that you can enter any ijump with the branded socks? We refused to buy new ones and afterwards (1 hour of argument) we were allowed to enter