You're the 1st person I've heard of to have GCU banned ?
Are you able to trade, and when you say you went over the limit are we talking 1-2 extra or something else.
I haven't tried a trade in a while so I'm not sure. I went over the 3 per limit a few times with different games. I was mostly buying for friends and presents for Christmas time. This is the error I get when trying to sign in.
E03: The information you entered is correct, however we are unable to access your account. Please call Customer Care at 1-888-Best Buy (I-888-237-8289) for assistance.