To be on the safe side, when you fill out the Complaint form for Small Claims Court, name him individually and the corporation if he operates in the form of a corporation. After his name as an individual, if he operates under a business name, write it like this,
XXXXX XXXXX d/b/a Sayville Auto Body and Used Car Sales
So, you will have all bases covered.
You do not need to have the work already done, You can go to Court with 3 estimates and tell the Judge you don't have the money to have this work done and you did not think it would need any work the way the seller advertised it.
You should also report him to eBay because eBay doesn't want people like him scamming the public because then it ruins eBay's reputation,
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