Jet Evaton refuse to exchange the school shoe for my daughter and I have a slip with me

Refuse to exchange my daughter school shoes while I have a purchase slip, I told them that this purchase was done online via Bash and the person that did it for me won't be available. My daughter need shoes to go to school and I was struggle to get Thoughees size 4 thatswhile we endup buying via Bash. I went to Jet Evaton Mall cz I checked on the system that they do have size 5 and only 1 item but the cashier told me that they want card that I used when I did the purchase. I made it clear that this person who have an account won't be able to come to the shop, I just need change size and I have receipt but they refuse to exchange it now am stuck with the small size and my daughter must go to school. Return or exchange item says do that within certain period, item should be in a good condition and provide a proof of purchase but Jet need a card so what if the person with a card went overseas and will be back after a year which means I can only exchange whatever i bought after a year.