Promotion /no stock

I was by Pick'n Pay Hyper yesterday during my lunch break, I needed veggies and bread. I noticed there was a special of the BB bread and you get the squares, thought this was great since my son enjoys squares for lunch at school. I went around the shelves looking for the squares but couldn't find it i concluded they ran out of stock and surely they will give me a receipt to come again when they have stock. I headed to the till and told the cashier about the squires, she first told me she was not sure if the sale is still on and sent the packer to look for the squares. I waited there for a good 10 min and she came back to confirm my conclusion already, the cashier then asked the packer again to go find the supervisor, again she went for a good 10 min or so, not sure why there are no buzzers or something. When the supervisor came she started relieving the cashier next to my till before she came to me and in all honesty I was frustrated by this type of service now, when she finally came to me she told the cashier I must go to the customer services to get them make a note on my slip, I then asked the cashier to cash my veggies and bread I don't want the squares anymore. The supervisor then tried to convience me to go there and I was not really having it I kept quiet and took my groceries and went.

What frustrated me is the amount of time they took to resolve my query, the lack of knowledge with the cashiers about the current sales at the store and what more frustrated me was having to wait for the Supervisor for her to only tell me to go to customer service. I honestly didn't enjoy how I was treated yesterday.