I would like to assist your with this .
iTunes purchases and account details :
Your billing info may need to be updated if there is a problem with purchases or free downloads.
1. Go to https://myinfo.apple.com
2. Log In with your Apple ID
3. Update you account info.
4. Check the Address book
and Phone numbers - Please match that info with your credit card.
5. Once completed save and log out , then open iTunes and update the same billing information to the letter .
If this is not a problem there maybe an internal issue , Moving house or a change of address can cause account issues , this will have to discussed with Apple Directly as they have access to your details and store purchases .
Card and payment issues and inquiries..
You can email or phone apple support for help , they will be able to give you all info to your Apple ID and billing info and purchases made , Only apple can help with iTunes store info and purchases made within the iTunes store system , do not give your details to anyone else regarding your account details. Only use one account having more than one account can create problems down the line . .http://www.apple.com/contact/
There are many locations and contact numbers on the contact page above , please find the area phone number nearest to you or use email contact .
Please contact Apple as above and explain your issue and check your account is up to date and paid up to date with no outstanding charges due , you can check your store purchases with apple and see what is going on with the charges to your card/s ..
I hope this helps ,