lost my titanfall2 from my origin account

Do you have proof that you played the game on your account? Because there is only 1 way to lose a game on your account and that is if EA Takes it away, But they almost always ban your account for using a stolen key(as that is the only reason they take it away)

So perhaps have a Moderator or Admin add you on Orgin, and see that you've played TItanfall2 to help give you credibility.Other Than that theirs not much to do.