Refund complaint or so Called exchange complaint by the manager

I am so disappointed by Pick n Pay Protea Glen the manager was *********** to mention just the least of the ridiculous service on the 08/08/20 I purchased 2 yogurts which were on special for R34.00 for 2 I asked the packer who was packing yogurts on the fridge and he confirmed yes they are on special for 2 however later at home as I checked my receipts I realized I was charged R39.99 for 2 and I obviously thought they over charged me and went past by pick n pay on Sunday to request the difference obviously. I was flabbergasted when the manager asked me where are the yogurts obviously I bought them to eat them and when we went to the fridge the price tag for the special was on the other brands of yogurt should I also mention as I was waiting for the lady to go get second opinion on what she can do I then went to the fridge to take a pic of the price and where it was placed it was not there and I returned to the till and the manager was back with another manager so they said. As I told them about the price tag removed on the phone their response is it could be the people from pricing and that is nothing to do with them shocked I was what a coincidence I was further asked what was the packer of the yogurts wearing the day of my purchase I would think when I go to pick n pay I don't know if there are subcontractors or whatsoever to me I am at pick n pay and everyone should carry the brand the fact that the manager told me there is nothing she can do and asked me what shift the packer was he on does that lady mean I understand the how about of pick n pay or were both ladies making fun of me. To them its just R27.00 difference to me its called customer service I am just disappointed at how they easily man handled my query and told me I must bring back the yogurts since I want the difference they over charged me what a disgrace pik n pay - Furthermore she told me pik n pay does not have a complains department how ridiculous such a big company