GM read this

[batazdark123]

unband my account S42shockwave i w8 months but still band

[batazdark123]

says ''Log in faild unknow error'' ***

[BrotherVT]

It normally states if your account is banned. If you are receiving the message "Log In Failed; Unknown Error" it might be because you need to clear your browsers cookies/cache/history.
If that doesn't work, then try THIS THREAD which provides to you plenty of other methods in order to log back in.