Why did I get double billed for Apple TV when I upgraded to Apple One?

Bundle Apple subscriptions with Apple One - Apple Support

If you see 'apple.com/bill' on your billing statement - Apple Support

If you think that doesn't cover it:

Click here --> https://support.apple.com/choose-country-region Select your country, then a product. If you don't see one that handles your issue then keep experimenting with selections until you reach one that gets you a chat session or a telephone call and get the representative to redirect you.

or:

Contact Apple for support and service --> "See a list of Apple phone numbers around the world."

Click here --> https://support.apple.com/HT201232