You can marra, you can even spend a small fortune going to court and winning, unfortunately if they won't pay their bill what chance have you got at legal costs? We won a court case at Christmas, I knew when I started it getting cash out of it was next to impossible but I did it anyway on a point of principle, but when principles cost you cash you tend to become very pragmatic about the whole process.
If other's do it very different and successfully, good on em, but when you are as small as we are you are dealing with others who have legal teams and little old me jumping up and down is not going to work.