Revoked means that you cannot continue playing it. If you want to play it again, you'll have to acquire a brand new copy either by buying it yourself or —God forbid — trading for it (again).
As for your keys, you'll have to wait for Steam's reply. You may or may not get your keys back, and the conniving twerp that was behind all this may or may not be permanently banned from trading for committing fraudulent behavior (if he or she isn't already!).
PS What do you mean Steam Support doesn't reply, when exactly did you submit your ticket?