Pathetic customer service and unlawful return policy

My daughter received a gift for her 1st Birthday in July this year, the dress was size 18-24Months. I had decided to keep it for her to use for Christmas. Last month, I decided to try on the dress and noticed that it was small. I went to the Naartjie store in Pavilion today and they refused to exchange it, saying that they only do exchanges within 30 days. I was 'assisted' by a consultant name Nomzama Nzama and she was pathetic to say the least. She didn't even listen to what I was saying and kept telling me that it's over 30 days. I was trying to make her understand that it's impossible to forsee the growth of my daughter and how can I keep a dress, which is R440, and yet she cannot use it because it is small. She then said that there was no one else I could speak to as she is the Manager. I requested to speak to someone higher up and she stated that no one is available for me to speak to however she will call the Area manager. At first, she was very secretive about his details but once I demanded to know whom it was, she said his name is Preston Naidoo. She called him and did not want me to speak to him and he told her that it's over the 30 days and they cannot assist. I tried to explain to her that the back of the tillslip states 'items are generally returned within 30 days' and not only, however she refused to help. I have the original receipt, which was stapled to the tag since date of purchase and the garment has the original tag. Please can this matter be investigated because I refuse to let a R440 dress collect dust in my cupboard. Customer service like this for an international Brand is pathetic. PS: Even the Consumer Protection Act (CPA) allows for a 6 month return policy. I will be escalating a formal complaint to the NCC/CGSO if this matter is not resolved.