You have not done anything wrong ... RIIIIIIGGGHHHHTTT. They just banned you for no reason. I see that happening every day. Your sentence structure, punctuation and grammar all suggest you are either young or simply poorly educated but either way if you have not don anything wrong in game and you state that the only thing you were doing was entering a credit card when you got banned, it is pretty simple to deduce you were using a fraudulent credit card.
It still does not give you the right to come onto the forums and beg for file sharing which is not only against forum rules but also legitimately ILLEGAL as you would be violating copyright patents, etc. for file sharing and can cause you and the person whom might have helped you serious fines on top of another banning. So why would you now want to get your brother's PS3 banned from the system?!
Again, wow holy entitlement issues Batman.