Bull**** customer service from a manager at Clear water click

Very ugly customer service from the manager Patience Nomvalo at Clear Water Clicks store. I went to buy Glilletes match 3 sensitive blades 8 as I saw them for R240 behind the cashier till and it was buy 3 for 2. When I ask a cashier Trevor Zwane he realised that the price for 4 blades instead of 8 blades but he called a manager Patience who refused yo give it to me with the price that I saw and gave me a bad attitude and also gave me her back and left like I am stupid inside the shop while other customers were looking at me like an idiot. She never gave a damn about that and went back to her office. Poor cashier Trevor felt sorry but there was nothing that he can do including his senior by the name of Daniel. I wanna know this is how clicks manager treat their customers when they are on the fault or I was undermined. How did she became a manager which such attitudes? Please help me because she really ruined my day