Dishonesty at Pick n Pay Aero Centre

I went to Pick n Pay Aero Centre in Bonaero Park, to purchase flora margarine that was on special, my mum took a picture of it when she went to the pick n pay and did not have her smart shopper, the sign read assorted 500g flora 3 for R70, I took 3 flora gold and paid, as I was leaving I noticed I paid the full price for the 3 flora, when I spoke to the teller regarding this she walked away and came back saying there was no sign, when escalated to the manager I was told there was no special and also that the camera footage of who removed the sign had nothing to do with me, I do have evidence of the sign stating the special and assorted with no exclusions. I am extremely disappointed as this is dishonesty, I will no longer use pick n pay as this shows a lack of transparency and honesty which is part of treating customers fairly and it should be a principle in the retail industry.