This Apple Account has not yet been used in iTunes Store

New iPad and apple account. I try to download any app in the App Store for the first time and it asks me to review my account information with the pop up ‘This Apple Account has not yet been used in iTunes Store’. I click ‘Review’ and this opens a window to confirm payment details and address etc., which I have entered and verified to be correct. However it asks for the card verification code (the three digit code) - as soon as I try to type anything new into any field in this window, it immediately closes and I am back to the App Store page. This means that I am unable to download any apps at all. I have tried everything from a hard reset through to a total iPad reset and the problem still persists. I am at the moment struggling to work out why I have spent to much on an iPad which is so apparently useless…. Thank you for any help