Bad customer service

I was gifted with a gift of shoes for my birthday on 3 September 2022. When I fitted them they didn't fit, they are small, I went to ZARA Menlyn on the 18 September 2022 to exchange them for a bigger size. When I got there explained to the store manager that the person who got me the shoes is in Nelspruit, but they sent me the receipt on phone. They refused to assist me with exchanging the shoes, now I'm stuck with shoes that don't fit me. In order for me to get the original receipt will mean I have to spend extra money I don't have. Zara's policy is unreasonable for clients and if I can't get that receipt before the 30days, it means I'm *****ed and money has been wasted.