Bad customer service

I made a laybe at woolworths Kempton Park and three days after taking the laybe out I decide to make an exchange, the exchange I then made at birch acres because I was closer to the that store on that day. When the cashier made the exchange she noticed that the receipt that I was given didn't have a date of when I had taken out the laybe. She then decided to call the manager to ask what she must do in this case because apparently the problem was that I bought with cash which was a bit hard for her to just process. She then called the manager to explain this and the manager wanted to know why I was exchanging (I could hear her on the other end talking to the cashier) and then she ended by saying that the cashier must tell me that next time they will not exchange for me. I then asked the cashier whether it was my fault that the receipt didn't have a date and she said "no she was just saying that we shouldn't exchange nor refund if there is no date" trying to defend what the manager had said. I then asked her how their store works, why she didn't call the Kempton Park branch to verify when I had taken the laybe out and she responded by saying "I can't just call the Kempton Park branch before calling the manager". To me all this made no sense, firstly the people that work in that store show no pro activeness what so ever because had the cashier called the Kempton Park branch she would have gotten the exact date from them as to when I took out the laybe then call the manager to say customer has a receipt that doesn't have a date however I have called the branch where the laybe was made and they confirmed the date. And ask to proceed. Secondly the manager herself has no customer service skills, how can she "say next time we will not help" is it my that their colleagues did not do their job correctly? Am I the one that must check that they do their job correctly. What she could have said is "help the customer and put the receipt aside" so that they can speak to the Kempton Park branch to make sure that the same mistake is not made next time. I am highly disappointed in this store and the kind of service that I got, my main problem is not with the cashier but the manager I believe she should/could do better.