cancel I cloud storage charge

Read this support article about how to downgrade or cancel your iCloud+ storage plan on an Apple mobile device, a Mac, or a PC. --> Downgrade or cancel your iCloud+ plan - Apple Support

This support article is Recommended by Apple as the preferred* resource for identifying payments you may see on a bill.

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

"If you checked https://reportaproblem.apple.com and your emailed receipts and you're still not sure why you were charged, contact Apple Support" using this link --> https://getsupport.apple.com/?caller=ikb&PGF=PGF51002&category_id=SC0060&symptom_id=21084

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* I have a payment of $2.99 per month what … - Apple Community