I strongly recommend reading "I fought the PayPal and I won", https://news.ycombinator.com/item?id=33462658. If you feel you're in the right, you should study the eBay user agreements, figure out your options, and exercise them.
> "Virtually every modern-day service comes with a gargantuan boilerplate contract that governs everything from privacy policy and liability indemnification to which one of your children you agree to sacrifice. Since you are reading this online, you have likely hit AGREE on hundreds of these without reading a word of them..."
It looks like MacDonalds will cover the arbitration costs of anything over $250, so it's probably a lot easier to take them to arbitration than suing them. That being said, arbitrators might side with large corporations more than a judge would. Alsom, IANAL but part 11 of the settling disputes section seems to say that it's still possible to do a class action lawsuit against them.
I strongly recommend reading "I fought the PayPal and I won", https://news.ycombinator.com/item?id=33462658. If you feel you're in the right, you should study the eBay user agreements, figure out your options, and exercise them.