Poor Customer Service

On Monday the 17.06.19 I popped into Pick n Pay Tsele's in Moletsane Soweto to buy my basic stuff as usual.I wanted a toothbrush so on the isle I picked up a promotional pack of two toothbrushes under a prize of R22,95 and it was a few of like ten of them in a row and when the cashier Kate Moeketsi at the till scanned it was R74,95 and I told the cashier that the price is not the one I saw marked on the toothbrushes and she called the supervisor by the name of Ntebaleng, whom I went back with her to confirm the price of which we found the same price I mentioned to the cashier,she then told me that the price is not correct and it is not for the toothbrushes that I want and again I should always read the description of the product on the price every time before I pick products from the shelves,which I could not understand I then asked her to call the store manager cause I told her that I want to pay the price I saw and it was not my fault that a wrong price was marked on the product,and again it is not my duty to read what the description says after all. The manager by the name of Lulama came without even greeting me, he just said the lady explained that the price was wrongly marked and there is nothing that he could do to help me.I felt hurt with the kind of treatment and bad service they have given me as their usual customer and it was not even the first time I receive such poor service in that store, which I of course did not report. I ask n myself now that as a consumer what rights do I have to this kind of scenario? Why do I only experience such bad service from my local Pick n Pay store compared to Pick n Pay's in the surburban areas?