I agree with Steve, You have not een the victim of fraud. But, you have suffered a financial loss. You need to consult a professional (lawyer).
Steve is also right aout not starting WW III. It's always better to settle these matters out of court. However, in your case, as you have been "jacked around" you need to get their attention and let them know you won't just go away.
As far as loss of value to your car, you need to pursue the person who hit you for that. (Assuming is was not your fault).
91 300E 120K
90 300SE 275K (sold)
92 BMW 525iM 120K
90 BMW 525iA 175K
85 300D 175K (sold)
84 300SD 245K (sold)