Either try one of the cards that you've already used on the account, or try contacting iTunes Support and see if they can/will reset the count/limit on the account : http://www.apple.com/support/itunes/ww or https://www.apple.com/emea/support/itunes/contact.html
It says I can’t put my debit card on my Apple store, it said I used to many cards on there how to I clear it so I can put my card back on there cause I can’t download nothing to my phone without it
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How do I put my card on my App Store it says I’ve used too many cards I need to clear it and put my card on so I can download an app