You can’t go to court to file a lawsuit against Deca for banning you without evidence. This is because they would have to show evidence of you using the script or hacking which unveils their hack/bot/script detection methods. If they did this, hacked client users and other people will find ways around this detection system. If it violates the games ToS, they can ban you.
Valve, creators of Steam and Half-Life ban you without telling you why if their detection system marked you as a cheater. You can spend $60 on an online game and be banned, to never play multiplayer again (unless you buy another copy with another account) without ever being able to do anything about it. I think they’re in the right.