Unable to play coop in one ps3 or multiplayer in one system.
Called support but they don't know the answer, they just put me on hold every two minutes...
You haven't exactly given information s to what's wrong.
How am i supposed to know if it's a connction issue, if you haven't created a second PSN account or if it's anything else?
Come on dude, give us some info if you want help. Tell us where it starts to go wrong and we can then try to help.