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I am in Tennessee (knox county)
I also am self-employed and lost about 5 working days due to the fact that this is my work vehicle and it was stuck in the shop.
I am sorry that this happened to you. You were defrauded.
You can sue the repair shop in Small Claims Court for the repairs that were made. Here is information on Small Claims procedures in Tennessee: http://public.findlaw.com/litigation_appeals/tennessee-small-claims.html
You may also be able to file a complaint with the Tennessee Department of Insurance and Commerce. Here is information on how to do that: http://tn.gov/consumer/complaint.shtml. This procedure won't cost you anything, so you should start there.