Which map were you playing on? I was on yesterday for perhaps 12 hours so everything tends to run together after a while.
If I remember correctly it was beachstrike and a few of us were in the 420 building. I saw a couple humans run up and shoot the cade -- the next thing I know the zombies inside the cade and everyone is tagged. I'm pretty sure I was the one that banned you, and I'm sorry about that, but as it stands the odds were against you from my point of view.
The ban shouldn't have been for longer than 30 minutes. So it should be up by now. If not, give me your steam ID and I'll take care of it myself.