I have been screwed quite a few times. It's hard to ask for it back because most of them are going through hard times.

So i wait not thinking much about it because i am not tight for money and i could do without them.

However there is one person i bug to get my money back though not actively enough.

Edit - my point is if you NEED the money back call them on a regular basis telling them about your need or make up a story. But do call them on a regular basis.