Increased number of requests (cascading) is a violation which cannot be forgiven. Ban is forever. If you are banned for other reason (wrong login-password, preliminary connection to the server etc.), the ban is cancelled after you pay penalty. But your current ban will not be cancelled, sorry.
My suggestion is that you register again in the forum and billing using other login-password.
Finally, send e-mail to Moderator, maybe you will be lucky guy...
regards