I forgot confidential questions

Go to https://getsupport.apple.com . Click 'See all products and services', then 'More Products and Services, then 'Apple ID', then 'Other Apple ID Topics' then 'Forgotten Apple ID security questions'. If you have any problems with that try this form: https://www.apple.com/emea/support/itunes/contact.html

If you forgot the answers to your security questions, use the rescue email (Manage your Apple ID primary, rescue, alternate, and notification email addresses - Apple Support):

See this help document: If you forgot the answers to your Apple ID security questions - Apple Support

If your rescue email does not work, you need to give Apple Support a call - only they will be able to help you. See this webpage on how to contact Apple Support in your country: There are either telephone numbers given or an email form:

Apple ID: Contacting Apple for help with Apple ID account security

Explain, that you need help with an account security problem.

You can also try to email the iTunes Support using this form: https://ssl.apple.com/emea/support/itunes/contact.html