I am going to tell you what a ticket broker told me when I called up asking them who this charge is from and why they allowed it; "Relax, just dispute it with your credit card company and you won't have to pay for it".
So, some kid, who got my card # (from an electronics retailer in NYC), worked with another kid who worked for the ticket broker (in NJ) - to get a free show.
And, NO body gave a fuck. My credit card company reversed the charge. No one was going to do anything about it. Now, if this was chronic, I would be part of the problem most likely. And the authorities would get involved.
Also, I am certain credit card companies claim these fraud charges on their insurance.
You however, want to give the impression that you will avenge and correct the beast that is Walmart. Maybe you should go down to that location and wag your finger in the manager's face?
Take some pictures of the indifferent look on his face as he listens to how you expect things to run in such an establishment.