Advertised discount not being given - emails not rep**** to.

This dates back to Nov 2019. I complained to PnP by email about a discount they run on Kassler chops/rashers, whereby, if 2 are bought there is a discount of R10.00 which was not being given on purchases, after getting no response from the managers of PnP Constantia (although the problem occurs at any PnP I happen to shop at so I suspect that its a national problem). Eventually I received a telephonic response to my mail. At this time I was told the "error" was being fixed. I have bought the same product (with its discount sticker) numerous times through December and the beginning of January, still with no discount being given! I have rep**** to PnP's "awaiting feedback" mail many times pointing out that nothing has been done and I am not satisfied. I have never had the courtesy of a reply to any of these mails. It seems to me that PnP are "fleecing" the public by advertising a discount and not giving it (are there other products on which the same thing is being done?) - in addition, it seems that the store management are not ensuring that these reported errors are fixed.