Left abusive marriage 6 months ago. I finally applied for child maintenance because he refused to come to any agreement. Now CMS have written to me that they have been unable to 'find him' despite me including his address, NI number and employer details! Apparently it's because he has not updated any of his records from our old marital home to his new address, so they can't 'prove' he lives there. They have even spoken to him, they have his HMRC record but they still can't proceed. I now have to submit court documentation with his new address on it but they are still saying there is no guarantee they'll accept that. What else can I do? It seems so ridiculous.