How to enjoy the game.

Go to steam, help, steam support, "Games, Software, etc.", search Dragon Ball Xenoverse 2 then click on it and press "Gameplay or technical issue", "I am having another problem", "I'd like to request a refund", in Reason put "The multiplayer doesn't work an submit the request if you have less than 2-3 horus.

After that you could play a good game instead.