Pick n Pay Westonaria

Yesterday I was at Pick n Pay Westonaria and there's a special of buy any four vegetable and pay R100, I took two 3kg of Potatoes and 2 kg Tomato and when I get to the till the cashier said two me if I take two of the same products the system will not subtract the value to ensure I pay the R100 for special I then asked her what is going to happen since I dont want carrot and onion which they were the only two products available on the special, she called the supervise and also told me the same thing and I asked again what is the solution since I want potatoes and tomato not carrot and onion the supervisor said to the proper delivery is coming tomorrow that is today, I asked her are you telling me to return tomorrow and she said let me call the store manager and the gentleman came he also explained what I've heard from the cashier ad the supervisor and I then asked what is the solution since your system does not subtract automatically be said the delivery is coming tomorrow I then asked him are saying I should come back tomorrow and he said well there is nothing he can help me with I then left but I'm wondering if this how Pick n Pay treats their costumers, how many customers received the same treatment as mine? Is this the quality service they promise customers and be treated like their money is has no value in building their brand and sustaining jobs for the same staff that treated me like I was unreasonable yet the special says any four, I dont think I will ever set foot at Pick n Pay I will rather take my business were is will be appreciated and be treated with respect.