This is important: in what way did they confirm that multi-accounting was fine?

Was it perhaps that multi-accounting was fine... but only for the website in general?
Or did you specifically ask about sportsbetting? If a casino tells you, "don't do this," and you create a new account for that purpose, is that okay?

If you simply asked vague questions multiple times, then you'll get vague answers - which may coalesce into a specific truth you don't like.