Marlena, Sorry to hear that, but after they are typically Lebanese, they prefer saying no, we don't know, instead of scratching their head and searching for answer and try to help you.
I am kind convince with what Boujasim told you, that you can send them a letter telling them that your husband can't register the marriage, because in Lebanon they don't recognize civil marriage. I know that they know each country rules and law, but on the flip side, that make me wonder why they are asking you to do that, as far as I know, they know civil marriage isn't recognize in Lebanon.
Has your husband been able to get any answer from the authority in Lebanon? I hear lot of people getting married civil marriage outside Lebanon, there has to be a way they are taking to make their marriage legal in Lebanon...did you try to connect the lebanese Concoul (don’t know what in English) in person, I hear people outside lebanon goes to the Consoul whenever they are facing problem