The worst service in the history of worst services

I was at The Cross Trainer the Grove Mall in Pretoria, there where this Fierce puma strap black was on sale the tag showed that the shoe was R499.00 but when I was suppose to pay I was advised that the shoe is actually R1500.00 and that another customer clipped the wrong tag on the shoe. The manager of the branch Portia told me that there is nothing she can do she cannot override the system.which in my opinion is utter nonsense, how can you be a manager and not have the power to adjust a price.she said only I.T can do that or I have to wait until she can get hold of their regional manager Paul Matau who was AWOL. While I was inconvenienced as a customer and my right where brutally violated.waited hour for this Paul guy to be contacted and I still dont have my shoe.how is that fair when there consumer protection act is clear on issues like these.i still dont understand why these small retail shops think they can violate our rights and get away with it.these is beyond bad service somebody has to do something about it,really