I have been charged for itunes eventhough I am not purchasing anything.

See your purchase history in the iTunes Store - Apple Support

If you see 'itunes.com/bill' or an unfamiliar charge on your statement

I don't think you were charged for iTunes but something bought using iTunes.

iTunes is free and comes with iOS. You are not charged for it.

Please read Writing an effective Apple Support Communities question. We are here to help. We are all users. We are not mind-readers nor clairvoyants. We only know what you write down and tell us. Be specific and thorough. Include your hardware information and installed version of macOS.

FYI: These are user-only forums. You are not speaking to Apple. if you need to speak with Apple Support, then contact product and tech support:  Contacting Apple for support and service including international calling numbers.

Thank you for your understanding and support.