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Get your child into counseling. You yourself get into counseling with a good therapist who will help you learn assertion, detatchment, and how to deal with a teenager who is playing both ends against the middle here. You and your ex are fighting through this child, and he is right in the middle of this and taking full advantage of it. It doesn't matter HOW many times your husband has your son call you and then he picks up. Hang up immediately. Contact him and communicate with him only through the recommended channels. Save records of all such communications.
Make SURE you are not getting manipulated into fighting by the father. He is maybe doing things you don't want him to do, but as a therapist will help you realize, you cannot control anyone else's (adult) behavior but your own. Your child's behavior, you have some degree of control over. Learn how to do this effectively. Be the one who follows the court orders as closely as possible.
Don't get all resentful about what dad is saying and doing. He's paying the child support, he's got the child on certain times and at certain days. During that time, let them work things out between themselves. The child will have to learn what his father is good for, what his father is really like. You can't protect him from this truth.
Work on what goes on between yourself and the child while he is with you. Be the one who is the grown up and the mature one in this situation. It will look better for you if you have gotten the boy into counseling if you do have to go to court. It will help wonderfully if YOU can get yourself into counseling to help you control and figure out how the best way for you to respond to this ex and this parenting situation might be. As for, "I can't pick him up because I have to work" I suspect you'd probably say, "I don't have time to get him into counseling because I have to work, I don't have the money to go to counseling myself" like people say they don't have the money to hire an attorney to represent them and there you go. Back to the same old thing you've been doing, which isn't working, is making you crazy.