See the following Apple articles:
View your purchase history for the App Store, iTunes Store, and other Apple media services
View your purchase history for the App Store, iTunes Store, and other Apple media services - Apple Support
How apps, content, and subscriptions from Apple are billed
How apps, content, and subscriptions from Apple are billed - Apple Support
Request a refund for apps or content that you bought from Apple
Request a refund for apps or content that you bought from Apple - Apple Support
- You can try to request a refund, refund only within 90 days.
- If you have requested a refund, you must wait until Apple has approved. Then you will receive a message from Apple.
- If your refund is approved, the funds will be applied to the same payment method that you used to buy the item.
See the following Apple articles:
If you want to cancel a subscription from Apple
If you want to cancel a subscription from Apple - Apple Support
If the subscription that you want to cancel is not listed
If you want to cancel a subscription from Apple - Apple Support