How do I get a refund for an unauthorized FaceApp Pro subscription made by my nephew?

My young nephew was visiting me, and to calm him down, I gave him my phone so he could watch cartoons on YouTube. Without my knowledge, he accidentally made a one-year subscription to FaceApp Pro. I did not authorize this purchase, and I do not use or need this app at all. The subscription cost 14,000 KZT, which is a significant amount for me, and I cannot afford such an expense. Please understand this was an honest mistake made by a child. I kindly request a refund and cancellation of the subscription.

[Re-Titled by Moderator]