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If you have a subscription, you are required to have a payment method on file.
Purchases - View, change, or cancel your subscriptions. https://support.apple.com/en-us/HT202039
Purchases - Subscriptions not billed through Apple https://support.apple.com/en-gb/HT207865
Normally, all sales are considered final, but you can ask for a refund.
If you have received a confirmation email, click the Report a problem link at the bottom.
Purchases problem. https://support.apple.com/en-us/HT204084
If necessary, contact iTunes Support. Either use the form or scroll to the bottom of the page in the 2nd link. Follow through the screens to get a chat or telephone option.
iTunes Store - Contact Us - Official Apple Support. https://support.apple.com/en-euro/itunes-contact
iTunes Support – world wide https://support.apple.com/choose-country-region/itunes