POOR SERVICE COMPLAINT

I bought a coffee cake tart at spar today,because I wanted to treat my parents but when I got home the topping was wrong. I took it back to the person at spar who sold it to me and then she called the manager to find out what to do. The manager asked me whats the problem in a very rude manner. I told her the topping was wrong then she called the bakery. When she had spoken to the bakery she didn't tell me anything she just swiped n card at the till gave me my money back and walked away. I feel like she could have told me what went wrong or something but instead she was rude and didn't treat me as customer with respect. They also have a win a car competition but they don't even tell you what you must do to enter the competition so how must I know how to enter the competition. I am very unhappy with the overall service at northern cape springbok's spar.