I can’t comment on the specifics on what constitutes “prohibited” multi-boxing as I am not well-versed in the technicalities. Now, my instincts tell me that there is more to the story because I highly doubt the location of a bull statue prompted a GM to give you a six-month penalty, or even get you reported in the first place. I am not saying a GM can’t be wrong, but if you got six months and still haven’t heard back after a week and a half, then they may have actually found something that was prohibited, even if you didn’t know it was prohibited, or there at all.
This is purely speculation of course. But considering that in my personal experience, I had my previous name openly insulted, questioned even in the forums, and resulted in constant harassment and threats of reporting, though I was never once penalized for it. A GM even told me it wasn’t against the policy. This is why I am assuming they found something and did not just arbitrarily decide to give you life in the penitentiary.
Did you try to appeal this?