What shall I do when I worked 2 &1/2 weeks and only got paid $20.00?

Any one who would go to a complete stranger's house should be grateful they are still alive. Accepting a job getting paid under the table is illegal, so you really deserve what you went through. You need to start watching the news to know just how dangerous what you did was - serial killers lie - especially about how religious they are. Please wise up and do not ever do anything like that ever again.