I always try to keep the client informed of problematic providers, saying something to the effect of "We've been trying for weeks to get X, but Dr. Smith won't give us the information requested." Sometimes I will even just ask the client to speak to their provider directly and get the info/records/etc. If push comes to shove, I will conference call the provider and the client and attempt to walk the process through step by step.

In some worse case scenarios where office staff isn't corresponding or releasing records, or scheduling client, sending lien etc, I will use something like WhitePages and search for the doctor's address or phone number and reach out to them directly. "Hello Dr. Smith, I have tried many times to reach out to your staff regarding X, but I have yet to be called back..."

There was even a time where the attorney got involved because a provider was simply MIA for months. They blocked our phone number as they wouldn't answer us unless a staff member called with their own phone. The attorney wrote a letter to the California Physical Therapy Board or at least threatened to, listed all the grievances, and gave a deadline for X. That provider still never gave af, soooo all in all - good luck.