Zm has been having trouble with ppl trying to get humans tagged on purpose lately so I can see how you would get banned.
Since your not on SourceBans I have no idea whats going on. What does it say when you try to join?

If you can guess around the you where on Sorrento today I could watch the demo for ya? Go here and look and see if the maps ring a bell:
ftp://zm.ibisgaming.com/

Looks like Sorrento was playing at: 4am,6am,9am,1130am,130pm,3pm, and 530pm. If the ban was today.