PayPal does not offer protection for these, as they have 0 way to verify tht you did or did not deliver.
If you take them to court, you are losing a ton of money, and your case will lose. Your attorney is a complete idiot to think he will win, or he is scamming you also by lying to you.
I reluctantly have to agree. You're going against Goliath armed with nothing but a spitball and a straw. You have a better chance of memorizing the SHA256 algorithm and brain-mining a block of coins.
I would take that same anger and energy and channel it to a place where you can make a change. There are many.