From Rock Paper Shotgun:

I’m building up quite the portfolio of affected gamers, who find after a forum violation they’re unable to access their Origin games. And within this is a more disturbing trend – those who are finding that their forum bans are, without explanation, becoming permanent bans. Permanent bans from accessing their Origin accounts, their Battlelog accounts, and therefore downloading purchased games, and playing online. Something which obviously raises serious questions about consumer rights, which is of course another angle we’re currently investigating.

Most exceptional perhaps is Aaron, who after receiving a 72 hour ban was told by EA support they couldn’t help because “the game developers control this”. Pardon? His crime? Someone else swearing on the forum, with his username in their post. Trying the live chat support instead, he was then informed that his account was permanently banned, and that “all property, items, and characters associated currently are or will soon be deleted.” Followed by, “Is there anything else I can do for you?” Aaron tried again, pointing out that forum bans shouldn’t affect games. And then came this incredible reply:
“Please be informed that your account not only suspended, But it is also Banned, So you will no longer to play the game in single player.”
If you use Origin, don't post on the forums. Or don't use Origin.