I bought a milk bt the price I saw on the shelve

Hi I'm miranda I'm regular customer at spar Brits north west. I went 2 spar 2 buy nan pelargon baby milk. When I arrive a the till point the cashier ring the milk the the price was different. The price on the shelve is R255 then on the till is R259.then I asked the cashier then? she said I'll go and ask my superior then she came with her. The superior said 2 me what's wrong \with an attitude"I said 2 her the cashier told u what's wrong then she said I can't give u with this price then I ask her reason being? She said bcoz .Then I said bcoz? Is it the answer that ur giving me? she said that's nt our fault it's the merchandiser so then I said 2 her bt it's unfair bcoz me I've got nothing 2 do with who's fault it is.if I c the price I pay that amount.I said y don't u right on the door that the price that u c it's nt the price u pay. I ask her what's ur name and surname she said I'm Nthabiseng nd I don't have a surname. I don't care if u report me.spar knws Nthabiseng 4rm Brits"