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Your ex's attorney is responsible for accepting legal pleadings on behalf of his client for as long as they represent their client. As far as questions or attempts at settlement or negotiations, her attorney does not have to accept your communications and answer them. If you are having problems with your ex, then you can send them to the attorney and clearly state in there that you are sending them to the attorney to get answers because their client will not cooperate and this is your good faith effort to cooperate. If the attorney tells you to cease, then your next step is file a motion in the court asking the court to order what you want and bring the matter into court. It might be that the ex is not paying her lawyer any longer and the lawyer is not willing to do anymore work for her and in that case the lawyer is not even obligated to respond to you at all.
Your next option though is to set the matter for a hearing and get the court to issue orders on what you want since the ex is refusing to negotiate or deal with you in good faith.
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