You're welcome, bossfrog.
Public Health, as an agency to contact, comes to mind. Maybe Medicaid and/or Medicare.
We have the same problem with a psychiatrist who won't return our calls on MNs. The psych director has instructed us to just call her and she will reach the psychiatrist via a "backdoor number".
Once, when a patient attacked me, that was totally behavior, and the psychiatrist wouldn't return our calls, we contacted her. After not hearing back from either of them after numerous attempts, the director finally called us back, apologizing that she had fallen asleep. She apologized profusely. I gave what for and she gave us her husband's phone number.
"Oh?" I asked, "If we can't get a hold of the psychiatrist, and you don't answer the phone because you're asleep, we should call your husband? So he can wake you up, so you can wake up the psychiatrist?"
"Let's take that plan a step further!"
Good luck, bossfrog!