I'm not particularly sure if there's a school out there that specializes in medical malpractice. Just go to a school in an area where you can see yourself practicing and living. Every school has some sort of medical malpractice classes. There's not really a school I know of that specializes in it.
It might be wise to call local (city and county) government offices -- or check their websites -- for free or low-cost lawyers. Find out how to proceed from here. (You may qualify for free or low-cost legal advice or representation.)
I also recommend looking at www.BudHibbs.com -- click on "agencies to avoid", the "watchlist" and "worst collectors" buttons at the top of his page. His site offers a lot of good advice about "junk debt buyers". (Click on the agenies name, if it's in the list, and read about them. Also, click on "Consumer Comments" to read what others have experienced with the agency.) Usually, if someone is here, complaining about an agency, it is in the list!
You should contact a lawyer for interpretations of the FDCPA as it applies to you. Again, you may qualify for free or low cost aid.