Very,very angry customer

I went to boxer in braamfischerville on the 31st December,I never saw the annoying and stinking attitude that the manager can give to the customer. Maybe because he saw me not worth his position or just because I was dirty as was painting in my house so he told himself that this dirty person cannot tell me anything,eish I'm so angry at that manager. When I arrived there was a gondola end full of Coke's and priced R60.00 X3 I took it because I saw it was difference of R15.00 and on the second one it was ultra mel custard R40x2 price and I took it,but when I reached the cashier's till it was a different story regarding ultra Mel and supervisor was called who was so sweet and I told her what is my concern regarding pricing and she asked me to wait so she can call the manager who arrive with that attitude and I told him what's the problem and he told he will never give me with that price and they have been merchandising like that so they won't change it just because I don't understand how they pack,I tried to explain and asked him the difference between coca cola shelves and ultra Mel he told me about frimax chips and Oros on the following shelves and I told him yes I could see that but what does that price board say on the shelve,he told he won't give me and left,I took pics and paid my items and waited for the person I was with and we left,I was so angry in such a way that I expected he treat customer with respect not take advantage of the looks and give attitude,worse of them all it's the nearest store for me and i love shopping,paying my bill and buying electricity there as cashier's are so friendly, but after this incident ,I don't see myself there and it's worse that my mum even get her Grant payment in that store so if a manager can treat a customer like that,iyoh I get scared for other customers or elderly people who will need help from him.