Nothing Try about Truworths

My daughter received a gift with gift voucher, tag and packaging in tact. Since July we have unfortunately not been able to find anything for her that she likes and we thought going back and getting a voucher would be best until she did but we never got to do so until now...she finally found something she likes at Truworths Eastgate in Johannesburg, But of caus it's way too late. However I do feel with us having everything needed to do an exchange I don't understand why we cannot be assisted. Yes it must be within 30 days, but sadly Truworths is not for everyone as we know, especially a 14 year old girl who's style is not Truworths. I'm extremely disappointed that such a massive retailer cannot take this case as merit and assist us. She was so delighted to find something but sadly was disappointed as no store will assist us. Even Edgars Eastgate assists with a gift exchange after 30 days. Also, the bag is still available online, so if the item code was no longer on the system I would sort of understand... But this is not the case. How can no one be willing to assist us