Account page :
Our macro detection system has been monitoring your account closely and has detected that you are using illegal 3rd party client which violates the rules of the game and breaches your terms of service with Jagex.
etc. etc. etc.
Same issue as the OP, with a different bot. Got a message saying that a Botting client was detected (Runemate). Although the admins around here seem to be stuck up their arses and anyone who dares defy Runemate gets their post removed. I'm very well certain its a client issue.
Edit: Why...