False Display

I went to the new spar in Sebokeng zone 3 at16:45 to buy 60 large eggs, when I got there I saw the price was R40.01 large 60 eggs and I took them, when I got to the till it was R71 and I told the teller that on the shelf it was parked on the R40 side and as a customer I can not inspect shelfs and pricing so what I see I buy and I expect the same amount on the till. the supervisor came and she was just telling me its their packing guy who made a mistake and just left and she didn't even bought to assist. when I returned to the till the lady had put all my staff on the floor and I was willing to buy the eggs for R71 but she just put them in a very unattractive manner my buns were on the ground looked like she just threw them there. I m not happy with the service I got.