I think the woman has had issues with Wal-Mart before, many issues, having time to waste she decided to make an example of them. Can't say it would be worth my time or effort but maybe she had nothing better on her agenda.
I do know the Wal-Mart over here is famous for false advertising...they print an apology in the paper a few days later which gets them off the hook. This happens weekly, people flock to the store for the advertised special only to be told they didn't get the delivery or that it was a misprint in the flyer etc.. The retraction in the paper lets them off the hook.
Wal-Mart is not a popular store with most people around here, they pull some awful scams.