Used different Credit Card to sign up again, went to edit my page but now says Error: Sorry, that name page has been claimed by another user (which is me). Please contact our helpdesk for assistance if you believe there has been an error. Any help would be appreciated.
It sounds like you now have two user accounts, with the old one having "claimed" the page. If you can still log in to that account, you should do so then click this http://pro.imdb.com/startover_confirm and relinquish it with the old account. If you cannot log into it, do as they say and contact them at the Help Desk via this form. Staff won't help you with account issues here on a public board as private information will need to be shared (as the main page of this forum states).
For future reference, you don't need to create a new user account each time. You can have one user account, cancel and restart Pro using the same one. While not a Pro subscriber, the regular, non-paid user account can be used to access and use site features and add or correct information on title or name pages.