Billed for no product

Last week my brother went to Woolworths Jabulani Mall to buy a cake using my bank card. He was told that there was insufficient funds in my account which left me confused. When he came back, I checked on my app, the transaction went through and he went back to the store. He was told the money will be reversed in a day or three. Their speed point had a problem, they were supposed to call the bank to reverse the money because the transaction went through. I can't call the bank as they won't reverse it because they are avoiding *****. I'm not happy, they shouldn't expect me to be polite when I show my face at their door