I will not have a problem proving the negligent acts. I have incurred delays and costs caused by their failure to follow the proper procedures in the dispute.
This was a credit card, not debit as stated.
The major problem with your potential claim is the expense of pursuing it may very well far exceed whatever recovery you are legally entitled to recover. Unless you could prove conduct that was fraudulent or intentional [you describe it as "negligent"], and/or that represented a continuing course of conduct involving many other debit card holders such that a class action could be filed, it is probably not economically feasible to pursue such a case.
Personal Injury Lawyer
This is not a personal injury question. I have reclassified your post so that hopefully you get answers from the appropriate lawyers.