Refund money for subscription

my little sister installed the app without my knowledge, and she told me that she didn't know anything about a paid subscription . In fact, I think he tried to cancel it, but didn't figure out how.

This was a mistake, I didn't give permission for this payment and only found out about it now! The transaction took place yesterday morning, one day passed (the traditional deadline for a refund from the App Store is 90 days, as far as I know). I have not used this program, it's not some kind of trick.

Please help me get my money back and cancel my subscription. The dollar to tenge exchange rate is very high now, and I can rent an apartment in my city for half a month with this amount.