Well if the ban was in 2013, and considering it was for jailbreak (which is literally dead :(), I'm down for an unban. Just to elaborate a bit on the "Mass freekill" reasoning, on the server of which you were banned, there was a ct and a t team, the ct team would have a warden which would give orders and whoever doesn't obey is a rebel, and are able to be killed. If they are killed for no reason at all, that is a freekill, and in your case you killed a large amount of people for no reason, which is why you were banned, kinda surprised they went straight to a perm but either way.
Also adding on to what I said, either way 3 YEARS is more than enough time for something like a mass freekill. +1