Can I sue American Express for providing my card''s available balance to third parties without my permission?

I recently signed up for the new American Express prepaid card (americanexpress.com/prepaid) and loaded funds onto the card. I discovered after making several purchases, both restaurants and retail, that my available balance was being displayed on the bottom of the receipt. As a result, several third parties were able to view my personal balance information. I read through the card-member agreement and the privacy statement for my specific card and there was nothing that indicates my private information would be shared with third parties. I know it may seem silly but this is a serious privacy and security concern for me. If I was able to file a suit, I wouldn''t want to request money but rather than this policy be changed and that they take additional measures in the future to ensure cardholder security.