People don’t always comply with the Court’s orders. 

When they don’t, enforcement of the order may be your remedy. Depending on the facts, the person violating the order may be subject to jail time, fines, and/or paying the other side’s attorney’s fees. The most common types of enforcement actions are for non-payment of child support or spousal support, non-compliance with possession orders (not allowing the other parent to take possession of the child or not returning the child), and non-compliance with property division orders (not allowing the other side to take possession of property awarded to them under the Court’s order).
Sometimes, you may be the one served with an enforcement action, in which case you definitely need to seek legal counsel given the quasi-criminal nature of some enforcement actions.
Keep in mind…you can never withhold visitation when the other parent is withholding child support. The reverse is also true.