I do not have other accounts
How do you even know you can create a topic in Meta to complain about your ban? As far as I know, the banned-message tells you to send an email if you want to fight your ban, and it should also tell you the chances of getting unbanned are very small.
Still nobody said the reason for the ban
I can tell you with about 99.99% certainty you're banned for breaking forum rules.
I did send the message but nobody is answering, so at least tell me when and where I did break the rules.