To get your account un-suspended you will need to take it up with a moderator on the forums and talk to them.
If it is only a suspension then you will be able to access you account soon as it will only be temporary and carry on your ambassador duties.
Apart from that I think it is a matter of time to wait for your account to be un-suspended
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Can you still access the ambassabank? I am pretty sure that all you have to do to get an inactive status back to active is to just answer a chat :)
Here is a link to the ambassabank: https://xcl.xbox.com/chat/ambassabank.aspx