How long can an attorney retain settlement money after a case has been settled and the money deposited in escrow account?

Question Details:

My lawyer retains part of the money. Medical office, where I went for treatment, claims to have a lien on my case but I never signed a lien with them. Moreover, the medical office asked me to continue treatment after my benefits where closed. They emphasized that we will not owe them anything when the case is settled, and they will collect the money from the insurance company directly. When the case was settled the medical office came up with the unpaid bills, but with no lien. My lawyer claims to retain the money until the matter is resolved, doesn't answer my calls. Should I file a complaint? Important Notice