You do realize that in the T.O.S. of playing RuneScape, jagex put that everything in the game is their property and they are letting you use it for as long as you want. They also stated that since it's their property, they have the right to do whatever they want, whenever they want. Whether that be ban, mute, roll back, whatever.
So while I do get your point, you already agreed to their T.O.S. when you created your account. You can't really cry about it now. You can try to post on social media to try and get it reversed but anything they do is because they want to and they have the right to since you already agreed to it when you made your account.