The only postcard answer I can give you is this one.
Forum bans: have you re-read the Code of Conduct and the ban explanation, and are still convinced you did not break the rules (that badly)? Feel free to contact us about it here , but keep in mind that it’s no guarantee the ban will be overturned.
The staff on this forum cannot overturn or intercede I am afraid, It is a matter for the community team so you would be best to appeal or ask such questions via the links above.
That said, banned forum accounts cannot normally post at all, even on customer support, are you sure it’s not a case that many have had (myself included) where the forum is a little borked.
Couple of things you can try:-
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Make sure you are logged out of the OLD forums.
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Change your Bnet password and log back into the new forums and try again.