One thing is for sure...this mechanic you were referred too doesn't know what the faaq he is doing. I don't care how mean of a redneck he is I'd go in there demand my money back and if he didn't oblige me I'd take his azz to court and when he doesn't show up or loses, he'll pay or I'd put a lien on his shop his house and any other property he owns...just think about what you could have gotten with that money if the job was done proper the first time...your interior would have been done 3 times over. Don't know if you have some type of bureau in Fla, but in Cali (although they are fairly powerless) I'd report him to the BAR as well.
