My account has banned.. Where should I solve the problem?

My account has banned… Where should I solve the problem?
I have sent mail to this address (forzafb@microsoft.com) many times, but there is no reply.
I just logged in elsewhere and it was banned suddenly as I returned home.
I have posted on the support board many times, but I have no reply.
What should I do?

You can submit a ticket on the the official support site: https://support.forzamotorsport.net