Q: Apple itunes store charge me 11 items in my credit card but Apple send invoice to me only 2 bills. How can I check?

I would ring up Apple: http://www.apple.com/uk/contact/

If, say, you made 5 purchases at different times over a day, you may well receive a consolidated invoice covering all 5 purchases.   Check the total number of items against total number of items on the two invoices.   Bet it comes to 10 (unless you've bought more since).