Bills issues

If you see ‘itunes.com/bill‘ or an unfamiliar charge on your bank, credit card, or debit statement - https://support.apple.com/HT201382 - Does not mention purchases made under Family Sharing which might be charged to the organizer's card but will not appear under the organizer's purchase history.

Get help with an item purchased from the App Store, iTunes Store, or iBooks Store - https://support.apple.com/HT204084

Click here to Report a Problem or ask for a refund --> http://reportaproblem.apple.com - "Sign In for help with iTunes purchases made in the last 90 days" Subscriptions aren't managed through this link, see https://support.apple.com/HT202039

If you have unsatisfactory results with Report A Problem then:

iTunes [Store] Support - Use this form for assistance with account and billing, code redemption, or purchase questions - https://ssl.apple.com/emea/support/itunes/contact.html

Worldwide iTunes support - https://support.apple.com/country-selector/itunes

Go here https://support.apple.com/en-us/HT202039 and check your subscriptions. If you did not buy these subscriptions (and if you signed up for a free trial and didn't cancel in time then you bought it) then immediately change your Apple ID. Then contact Apple here: iTunes Store - Contact Us - Apple Support and explain the situation to them.