Update an expired credit card

If necessary, contact iTunes Support. Either use the form or scroll to the bottom of the page in the 2nd link. Follow through the screens to get a chat or telephone option.  You may need to pick a problem that is slightly different than yours to get a chat option.  

iTunes Support

iTunes Support – world wide

Remove the expired card and add the updated correct one.

Change, add, or remove Apple ID payment methods - Apple Support