Bad customer service

My name is Annet. I went to Woolworths Woodlands mall yesterday to buy few things grocery to cook for my son with my last money. They scanned everything and the lady was helping me she didn't include the butter nut from the combo. Then the manager said she must cancel and they will do the refund immediately to my bank account but no the refund take 72hours when they ask other colleagues. So as a customer I didn't know that and I had to go home without food and wait the 3 days and I ask Thabang tabane manager why she didn't tell me before they do the refund she couldn't answer me. That was my last money I even cried infront of everyone in the store they said they can't do anything to help me. I am still waiting for the money to be refunded I don't have food the money went through but I didn't come home with the food it is so disgusting to get such treatment at Woolworths. I want my money back. The manager name is Thabang tabane she seems like she doesn't know her work she was all over.