My Dad wouldn't ever go to a lawyer over it. He's just not a "sue" kind of person; so getting him to a lawyer probably never happen. The funny (for lack of a better word) is that my Dad is a big Walmart defender and shops there for everything that can be had at Walmart.
Well, if your father won't hire a lawyer, he is refusing to take the ONLY course that will result in him getting his money back.
You can't help him if he refuses to help himself.