My ex is violating court order regarding our son's visitation. What can I do as a father to stop her actions?

She almost never drops or picks him up at the court order drop off. She moves 3 or 4 times a year and doesn't tell me where my son is living. She enrolls him in summer school even though I have summer visitations (this is second year I don't have him for the summer). It's extremely hard to reach her and talk to my son, I haven't talk to him since June 17th. She claims she is in school and doesn't have time to arrange phone calls for me and my son. He is almost always dirty and clothes I provide disappear. I am looking for a solution to those issues. I have a court order but I feel helpless to enforce it because no one wants to help me. I went to the police one day when she said she can't pick him up and forced me to drive all the way to Scranton to drop him off, because he had school the next day.