In this case, you were spectated by our senior admin, and he banned you based on what he saw then. However, sometimes spectating can lead to false positives, especially with what the build was a year ago. Thus, we left your ban in place for you to either dispute or not dispute. Totally up to you.
For your information, we do not ban based on "hackusations" alone. Ever. Even a temp ban for that would be ludicrous.
Our bans are based on spectating, and in general, we always try to provide evidence either via video, or some other 3rd party software that verifies hackers. That way, if we do catch a legit hacker and he comes back to dispute it, we can throw the evidence in his face and let EA and PB know about it while we're at it.