Rage Shoes Pan Africa

I have received a Christmas gift from my mom, which are pair of shoes from so the shoes doesn't fit me, I had to go and do exchange because I don't have a slip, when I got to the Rage shoe store at Pan Africa Mall the shoes store only not the one with clothing, the dark tall lady was assisting me request for a slip even though I have explained it was a gift and the shoes doesn't fit, I went on call my mom she send me her ID number because she was using her account to purchase those shoes, she didn't even remember when did she buy the shoes, still they couldn't assist me, I went on using my airtime to call my mom until she sebd me the card number, they tall lady printed too many slips saying she can't find that transaction, the manager didn't bother to attend to me and take full accountability as a store manager who knows how to treat customers, I went home and today on 29/12/2018 I came with a proof of purchase and it was for 2018/11/23, the store manager tells me that its over 30 days they can't assist me, what kind of a service is that I know my rights as a customer, I can't wear those shoes what must I do with them, or should I also tell my mom to close their account because this people they don't know how to treat customers, I am very angry because if it was a white person this situation was gonna be treated differently, the worst part is when the manager tells me to call the customers service to lay a complain.