I had the same issue, I deleted everything and installed again. Now sometimes I get the connection to multiplayer, but every time that I connect in multiplayer game I am in level 1. Today in the morning I play a little and reach the level 11, now when I connected again to play, I was in level 1 again, like never played before! I am fed up with this, because a already played a lot and now I am in level 1, when I get the connection!!
This is BS mine works when ever it feels like working sad thing nothing is going to be done to fix this. Everyone move on and leave this broken game.
I've sent you a PM about what information we need.
The best thing to do is delete the game data and all DLC and then re-download everything. You can simply delete the game data and then re-install it and then go re-download all the DLC you have purchased.