It's the client. They know when you are using OSBot. I've had ban reasons state that I was using a known botting client called OSBot. Also the same for other popular bot clients. They state the client name in the ban reason sometimes. Rmate is the only client I've had this not happen to. It uses the official runescape client. Maybe use mirror mode instead next time. Change your IP too. Don't use vpns or proxies. Just change your home ip.