Bad Service

I visited the Shoprite store in Tembisa Kaalfontein Corner today, to purchase toys for the kids, and the was a puzzle that was place under a R24.99 pricing (the whole rack). When I got to the till it scanned as R59.99 and when I enquirer they told me that, that is the correct price for the item. The pregnant lady (supervisor) told me that she will not give me that time for R24.99, because that is not the price, and I told her but on the shelf it's priced at R24.99. She argued that someone placed that price on the shelve and I told her that not my problem, but she insisted that she will not give me that Item at that price, because the price is incorrect. Clearly someone did not do their job correctly, and the price I see should be the price I pay, so on what grounds is she refusing to adjust the price. The service at that branch is poor, I have been there a few times, and the one time I had to stand longer because, someone decided to assist a customer with more than ten items, at the ten items section, during my lunch and there were two tellers. On the 16th my colleagues and I went to purchase food and one of the cakes had an egg shell in it (as per the picture attached) and they went back to report it and the manager said what is he supposed to do, because these things happen, no sign of care whatsoever, and they refunded us the money back. Yes the area is a township, but as a brand doesn't mean you should succumb to providing customers with bad service, we should be getting value for our money withy great service. I am not happy with the service and with the fact that I was told that I cannot buy that item at the price I saw, because someone did not do their job right, the audacity to argue with a customer when the employee is the one at fault is appalling.