I'm gonna say you did something much worse then typical farming and swapping coins. Are you console or PC?
It sounds like your account is actually being audited which is why you're completely locked out. That happens on PC if your caught hacking. They are looking into every transaction you've made during and after whatever you did to get suspended to see if you did anything that is banable. Your on the high end of big trouble my friend, you'll have to ride it out until the audit is done.