Can't login DIIR,30day offline and i lose my game?

I already buy the game,and play it my DIIR Account Status is " Active".
but now,i can’t login,it tell me i havn’t online in 30 days.
so i try to reinstal the game,but, ican’t download it,there just “buy now”
just tell me what to do , theres no way i pay for the game 2times ,right?