First of all I would advise you always to remain calm and methodical (I know you are probably incensed and feel like murder but try to curb it!) and set up an account in which you can pay the maintenance payments until such time as either things change, or it is requested again. If he is such a horrible guy then it seems to me he would want to have the money coming in, but he is obviously a jealous and paranoid person. Now if he is this controlling I feel it will only be a matter of time before hopefully the relationship will falter. You need to be the rock that is always there for your daughter. If necessary write her a letter from time to time and also keep that. You will have them to show her later. Never give up. As advised go to a solicitor and above all do not ever sink to their level. If you get a chance, tell your ex wife that you will always love your daughter and that when she comes to her senses you will be there still. Good luck