keyclone isn't a cheat program, it doesn't automate anything so you obviously had something else going on.
In the department that detects hacks and bans people, Blizzard is WELL aware of keyclone and what it does, and multiboxing in general. They might have detected some unauthorized hacks that you ran on your account weeks ago. I don't recall any reputable source getting banned permanently for multiboxing in 2+ years.