The short answer is keep on training...........
However, are you being realistic about your expectations?
What is is that you think that you have trained your dog to do, what is his age and why do you think he is not listening to you, could he not, for example be confused and not fully understand what you want him to do. Have you given him enough reason to DO what you want him to do. What do you think is the "right way"?
Why not join, it is free and we can explore your issues more fully.
FWIW I have had 4 Weimaraners and they have all listened to me..........

(eventually) :D :D :D