Customer Service
Phone support
Menu path: Say "billing" or press the billing option in the Apple Support phone tree for purchase disputes.
Verified contact endpoint from cited source.
Source: Official | Confidence: high
Email support
No publicly listed direct support email for iTunes. Use this official message/contact flow instead.
Source: Official | Confidence: medium
Help center
https://support.apple.com/itunes
Official help center landing page.
Source: Official | Confidence: high