Our custody/support order said to pay monthly amount until child's 18th birthday then pay arrears until paid. Arrears was paid a year earlier when I refinanced my house. Monthly support was paid until child's 18th birthday then I stopped. He does not graduate until May but exwife's lawyer drew up papers the way exwife wanted them, we all signed and agreed along with the judge. How can I be contempt of court if I followed the order?