You mean a "mechanic" picked up your car from your home and you paid him before he did the work??

And you don't have any number to contact him at?

Did you know this person at all or was he recommended by a friend?

How long has he had your car and how long did he say it would take to fix it?
Did he give you any paperwork??

If you have no idea of how to get a hold of this person maybe you should call the police.

What was it doing that you called a mechanic for?

sorry I get carried away with questions.....