Next to using keyclone, were you using the G15 keyboard or any other software that simulates keypresses? Or did you really solely use direct keycloning of all your keypresses?

If you are certain you absolutely didn't do anything wrong, send them an email to have it looked into and the final warning removed as it was unjustified. However, I find it a bit dodgy and would almost think there's something else going on here.

But I'll give you the benefit of the doubt. :P