If it says it will be back shortly, isn't the site down? (Doesn't 'Server Busy' ring a bell?)
As for being unbanned, I won't tell you how 'cos you can return to BF after being banned.
Still, I bet someone will release it anyway.....
As for your question, ipconfig/winipcfg do NOT change your IP. If you want to, get dial-up or a static IP.