Is it permanently banned or just a couple of days/week banned? Then if the case is just days of banning you should just wait until it will be unbanned and take the suggestion that is what asked how you'd ban because there are really that case you spam on forum or other stuff related to it. But, if the case is permanently banned then I think the chance it will get back is not even at percentage of 10, cause I think you have missed some rules that really prohibited in the forum like copying some others post or getting out on web. And one thing could we know what account this is?