Thanks for reaching out in Apple Support Communities. I understand that you're looking to request a refund regarding some unrecognized iTunes purchases. I can see why you'd reach out for assistance with this and I'm happy to point you in the right direction. I'd recommend using the information and steps below to investigate where these charges may be coming from and how to contact iTunes to report a problem:
If you see ‘itunes.com/bill‘ or an unfamiliar charge on your bank, credit card, or debit statement
Compare your purchase history with the charges on your credit card and bank statement.
To view and search your purchase history, click or tap this link: View Purchase History.
The Report a Problem website does not show purchases from subscriptions or iCloud storage upgrade charges.
Check the status of your subscriptions
Make sure that your charges aren't from a subscription that you or a family member set up. Learn how to view, change or cancel your subscriptions. If you signed up for the subscription outside of the app, you must contact the provider directly to cancel.
Check all of your Apple IDs
If you ever added a payment method to another Apple ID, the unrecognized charges might have been made using that account. Check the Purchase History of each Apple ID that uses your credit or debit card.
If you share your devices
If you share your device with others, including young children, learn how to manage your password preferences.
If anyone else has your Apple ID password
Anyone who has your Apple ID password is able to make charges to your account. If you have unauthorized charges, change your Apple ID password.
Get more help
If you don't use your Apple ID to make purchases from the iTunes Store or App Store and see charges on your statement, contact Apple for help with Apple ID account security.
If you think you're being billed twice for the same item, it might be a payment authorization holdand not an actual charge. The charge will disappear after your purchase clears.