Pricing and display

I went to Spar to buy Red Bull, on the shelf which I took the photo 6 was 76,99. The lady said it’s not the price then I showed them that they put the price on the six pack even the price says six. Then they called the Manager Seun who said 6 is for dozen I said let me get them then. Then they said all is wrong. I’m very unhappy because the staff and manager didn’t know their story as it changed from one member to another up to four people. No one could explain then they said the price is for four not six even though it’s written 6.