You will need to cancel your subscriptions yourself and then you will be able to remove your payment method yourself.
This support article explains how to cancel a subscription from Apple on an Apple mobile device, Mac, PC, and online (see the Android section) ➔ If you want to cancel a subscription from Apple - Apple Support
Notes:
• You might need to scroll down to find the Cancel Subscription button.
• If you don’t see Cancel Subscription, then the subscription is already canceled and won't renew. An "Expires" date (instead of "Renews") means the current subscription has been canceled but will work until the expiration date. "Resubscribe" (or Renew) is just in case you change your mind about having it end.
• Deleting an app does not cancel a subscription.
• If you don’t cancel trials more than 24 hours before your renewal date, your subscription might renew.
• Free trials will usually automatically turn into paid subscriptions unless you cancel in time.
• If you don't have an Apple device, see the options near the bottom of the support document.
• Many subscriptions are set to renew automatically until you intentionally cancel them.
If you can’t find the subscription that you want to cancel, use this shortcut to jump to the section about what to do. --> If you want to cancel a subscription from Apple - Apple Support If this is a subscription not made through Apple, “you might have bought the subscription from another company. To find out which company bills you, check your bank or credit card statement. To cancel the subscription, you must contact the company that bills you for the subscription.”
If you still can't find a subscription or still have problems, contact Apple Support using this issue-specific link at the end of the section. --> https://getsupport.apple.com/?caller=kbase&PGF=PGF63006&category_id=SC0060&symptom_id=23208
Scroll down to where you can request a chat session or a phone call.
Alternatively, see a list of Apple phone numbers around the world ➔ Contact Apple Support - Apple Support
Read this document about how to remove a payment method from your Apple ID --> Remove a payment method from your Apple Account - Apple Support
Certain conditions may require you have a payment method on your account:
- You have active subscriptions.
- You are set as the Family Organizer for a Family Sharing plan
- You owe money for past purchases.
- What you want to buy cannot be paid for with account balance.
- Sign in with your Apple ID - Sign in to your Apple Account on the web or in your device settings - Apple Support - at the very bottom: "When you sign in to the App Store and other media services for the first time, you might need to add a credit card or other payment information."