im paying every month 4.39$ can you tell me what is that for

Queer Charge? --> If you see an 'itunes.com/bill' or an unfamiliar charge on your statement

If you have an issue with an app on App Store or billing --> Request a refund for an App Store or iTunes Store purchase 

Request —> You can also request a refund for a recent renewal of an in-app subscription.

Beware of --> Phishing & Other Suspicious Emails 

Know how to --> Identify legitimate emails from the App Store or iTunes Store 

Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams —> Use these tips to avoid scams and learn what to do if you think your Apple ID has been compromised.

no I can't, but if its a subcription you can check https://support.apple.com/en-hk/HT202039