Exchange policy, ****, to say the least

Previously, my sister wanted to use my account to make a purchase. Truworths refused, informing me of their policies and advising that I make those purchases. I made those purchases and shipped them to the North West. Unfortunately, the sizes did not fit and she had to make an exchange with the receipt. Truworths is still refusing to allow her to make a "size exchange while having a receipt (Size not exchange item) and insists that I should be there to provide the card. Due to work, I am only going to see my sister in 5 months, and she needs those outfits for a job interview ASAP. Truworths, what do I do in this case? As much as you are trying to protect the consumer, how are we supposed to live with such policies? Why don't you install some verification systems then, because as "African breadwinners, our siblings depend on us and we cannot always be on their curve to help them. I am very annoyed at this. Now my sister is waiting at the mall, not sure how safe it is, waiting for the area manager to accept or decline. This is very inappropriate. After 5 months, you will be telling me again that your exchange policy is one month,,,, The area manager now is telling me to go to the nearest Truworths, to get a permission letter sent out for just an exchange of a size. I am now taking a day leave from work to attend to your administration. This is exhausting to think such a big brand fails to accommodate its clients even with minor requests as this.....