How long have you been enrolled in the ambassador programme? Badges are updated manually, and since the beta and enforcement programmes a shed load more ambassadors have signed up, leading to somewhat of a backlog.
So you could try patience (if it's less than a week), or you could send a private forum message to one of the Mister/Miss forum support staff. To do this fund a post by one of them, under the post there is a little mail icon. This is the private message
feature (well hidden huh)
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