Hi , i already add one app but i didnt buy it , and i find out later a receipt from i tunes ?

You've checked the purchase histories of all iTunes accounts linked to the card : See your purchase history in the iTunes Store on a Mac or PC - Apple Support ?

If it shows there but you didn't buy it, and if nobody else has access to the account and did it, change the account's password if you haven't already done so (What to do after you change your Apple ID email address or password - Apple Support) and contact iTunes Support : http://reportaproblem.apple.com or https://www.apple.com/emea/support/itunes/contact.html

If it doesn’t show on your account(s) (and if it isn’t : About payment card authorization holds in the iTunes Store - Apple Support) contact the card issuer

If nobody else has used your account you must have bought it. Did it have an auto-renewing subscription that you didn't cancel ? Just deleting an app doesn't stop a subscription, you have to cancel it. Try contacting iTunes Support via one of the links that I gave and see if they will refund you as a one-off.