Apple care +
Hello I am being double billed for Apple care for a phone I don’t even have anymore can you please help
iPhone 11 Pro Max, iOS 13
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See: How to manage your AppleCare plan - Apple Support
If the other steps there don't help, see the following from the same link:
If your AppleCare plan still isn't listed with your other services, or if you need more help, contact Apple Support.