Your orders can contain a provision regarding weekly or regular telephone calls with your kids. I am sorry that you are having problems seeing your kids. Make sure you document these efforts, and her difficulties in a journal at the time. A family member or friend (not a girlfriend) is good have tag along as a witness. If it does not improve quickly, consider asking the court for modified orders and/or enforcement. As to discussions - just stop trying to talk with her. She has made it clear she doesn't want to talk to you. If there is an issue regarding the kids let her know by text and/or email. It creates a digital paper trail, and avoids an argument. At some point she may be willing to co-parent, but clearly is not interested now. These issues get complicated and it is not likely that you can resolve them without an attorney. Moreover, if you have not yet attended mediation with her, it might be an option to resolve these problems. Good luck.
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I agree with Attorney Langford. If you have a court order, these orders generally have provisions about contact and sometimes order how the parents interact. What you want is a paper trail-- text messages, e-mails, and police reports. Eventually, if she keeps this up, you may have to bring a motion for enforcement of those court orders. When you do that, you've got a better case than simple "he-said, she-said."
Your spouse is interfering with your relationship. If you do not have temporary orders spelling out your visitation and electronic communication and establishing set times to speak with your children by phone, you need to do so now! Otherwise, she may be in contempt of your court orders. And yes, all of this can assist you in seeking custody.