Creditor Repo My Car And Won't Send Me Bill Of Sale, What's Law For Mich?

Once the creditor repossessed your car it now belongs to them.  They may sell it at a private or public auction or do with it as they wish, except sell it to an employee of said creditor.  As far as the bill of sale, you are not entitled to one as long as you received no proceeds from the sale.  I am sorry.