I have a bill ie in my credit card

Abdel,

First determine if it is a real charge on your account, or just a scam phishing message trying to scare you. Phishing messages falsely claiming that you have a big charge from Apple are unfortunately very common.

But if it is a real charge on your account, follow the steps in here:

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

Abdel,

If the charge really appears in your credit card account, and does not correspond to any known charge that have from Apple, then go to the step (near the end of the document) to contact Apple Support. If it turns out that there was fraudulent use of your credit card, then you can follow up with your card company.

Abdel,

That sounds a little strange. Up to you how to proceed. Fraudsters don't usually get hold of a credit card just to buy one thing from the iTunes Store. If you are sure the charge is not from you or anyone you know, you can dispute it with the credit card company.