Please file a complaint with the FTC about her. I came online specifically to see what anyone had heard about Total Recovery Group, because they are very rude and was very surprised to see this letter AND that you have also been dealing with Samantha Martin.
I filed a complaint this very afternoon. Please please call the FTC (it took maybe 6-8 minutes of my time), they say the more complaints they receive the more likely they will have the government investigate the company and Ms. Martin.
Federal Trade Commission
Consumer Response Center
600 Pennsylvania Avenue, NW
Washington, DC 20580
or file a complaint online at: http://www.ftc.gov