Same brand and range price change

I bought l'oreal 24 hour base on Monday 31st August at Haasendal Gables dischem. I called them on Tuesday 1st September telling them I took the incorrect colour, I spoke to Natasha and she told me that I can bring it back, I told her I will come Wednesday. Upon returning the store Natasha found the correct colour I needed the exact same brand and everything, all the colours in that range was R158 but the one I wanted was R215, the same brand and make just a different colour. They refused to give it to me at R158 even thou the whole make up range was on special. I took the time and effort to go to the store and the female supervisor basically didn't want to listen to my reasoning at all. I want the same base, same range for R158, my time, effort and petrol was wasted and all in vein. I want the store manager to arrange that the base gets dropped off at my house because of the inconvenience and also I pay R158 for the same base and a written apology from everyone that was involved. They couldn't validate why the one is scanning R215 and the other R158, such a waste of time and inconvenience.