What can I do about a non custodia parent over stepping my rights as custudial parent for my children.

If you can't work it out with him you need to file a motion to adjudge him in contempt.  To the extent that you can document his behavior you should because you will be more likely prevail with your motion if you have concrete proof to show the court.  It's always difficult for a court when all they have to consider it two people's different versions of the same events.   Feel free to contact me directly if you would like representation in this matter.