Pick n Pay - Extremely Poor Service

I did grocery shopping yesterday at PIck n Pay Norwood's hyper and am amazed that after many complaints, over many years, they still can't get a price tag to match a product and when one goes to an in-store scanner they don't work. Also I don't dare to ask a staff member for assistance as they consider that an insult and walk away. I did my grocery shopping yesterday morning (23 March 2018) and took 4 cans of Farmgirl Baked Beans as they were marked R6.49 per can on the shelf. When I got home and went through my till slip I noticed that I was actually charged R9.49 per can. This is not the 1st time that Pick n Pay Norwoord has ripped me off due to incorrect pricing. In the past I've tried to take wrongly priced unused product back, about 2 weeks later, to this particular store and was informed, although the product was canned in nature, that they refuse to refund me for their error as its too long since my original purchase. I was able to show them my original till slip and also that they still had the product incorrectly priced on the shelf but this was not acceptable and so I lost out. I am now requesting for a customer service person to contact me via this post or on my mobile number that you have from my Smart Shopper details and tell me what, if anything, Pick n Pay is going to do about this ripoff and also what you are going to do about the total incompetence of the management of this store. I certainly know what I'd do with this so called management if this store belonged to me. Fire the lot of them en masse. Also please don't ask me to come into the store as I don't feel that I should lose out on the extra fuel that would be wasted because Pick n Pay can't price goods correctly. I still have the 4 cans unused as well as my till slip. Another complaint was that I was given a slip yesterday telling me that I will get R50.00 off if I spend R600.00 or more. About a week ago I received a text message informing me that I would get this discount on my next shopping trip if I did said shopping before 25 March 2018. Yesterday I spent over R600.00 and was not given the said discount even though I had scanned my Smart Shopper card at the till before a single item went through. Please again can a customer service representative tell me where I went wrong or if I was again **********. I await your response but certainly won't be holding my breath going by Pick n Pay Norwood's past lack of said response. (as posted on my FB page earlier today)