Complaint Review: Dr. Sharam Gholami - Urology Association Of Silicon Valley

I feel that I was treated very unethically in the situation noted below in my letter to the doctor in question. Of course the doctor never replied. Not even a follow up letter or anything ! They already have their money so I'm sure there will be no response from them. (VERY unprofessional)
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Dear Urology Assoc. of Silicon Valley,

I found your association on Health Net's website showing that you are an in network provider. I went to your office and gave the receptionist my Health Net card that she copied and I then filled out the insurance paperwork for my procedure. After being notified by your association that I had reached my deductible with my insurance, I decided to go ahead with the procedure on 9/23/08. A few weeks after my procedure I received a bill from your association for $1057 (of which I have paid in full only to avoid a mark on my credit) stating that the doctor from your association that performed the procedure was one of the doctors that was not in the Health Net network.
Two questions;
1. Why, when knowing full well that I am with Health Net, would your association assign a doctor to me that is not in the Health Net network ?
2. After putting me with a doctor that is not in the Health Net network why was I not notified of this BEFORE my procedure ?

Due to the obvious unethical action (and possible illegal) taken by your association,
I am requesting for the full amount of $1057 to be paid back to me immediately. If full payment is not received within 10 days of receipt of this letter I will be pursuing this to the fullest extent of the law.

Ron
San Jose, California
U.S.A.