Moon Family Dentistry Westwind Dental this dentist moved out of state and did not inform any of his patients he was leaving Phoenix, Arizona

I am really upset to have to send this because I really liked this Dentist.  The office was first known as Moon Family Dentistry run by the dentist Ronald Moon.  He was my sons first dentist as a child so we have been going to him for over 10 years.  He put braces on my son which I don't have a problem with because he needed them but my son only had four months left to wear them and when we went in for his appointment we were told by the staff which was all new that Dr Moon no longer worked there that he moved to Texas I believe and that they hired a new orthodontist who would be seeing Dr Moons ortho patients to consult with him how much it was going to cost for him to continue care.  Dr Moon did not inform any of his patients that he was leaving.  The new office Westwind dental would not give out any other information. 

 I already paid Dr Moon for my sons braces with my income tax and now I was going to have to pay another doctor for the last four months.  At the time I had just started a new job so my dental benefits hadn't started yet, not for 90 days so I didn't have the money to pay this new dentist. By the time my benefits started and open enrollment to add my son on came around it had already been almost a year since he was last seen.  The new orthodontist told me that he would have to continue wearing his braces for another year and a half to two years and it would cost $2000.00!  He informed me that Dr Moon was not an orthodontist but he was and that's why it was going to cost more.

The day I found out all of this there were a lot of other patients there for their appointments that were outraged which surprises me that there were no other reports on this.  Dr Moon is still apart of the new office because his name hasn't been removed.  The office is called Westwind Dental Moon Family Dentistry.  I of course did't and don't have the money to hire a lawyer or I would have done something about this when it happened.  Is there anything that can be done?  Can Dr Moon just walk out on his patients just like that without informing them that he was leaving?