Allegation: Unpaid invoice

This invoice is unpaid because while working for me it was thirty days when I got paid by my customers which some times can be 60 days motors get left us with work they never finished and turned it down then I found out while working for me he was approaching my customers and trying to sign up to them so they can wait 60 days to receive payment like I have to with some of mine there was no contract but a little respect would of gone a long way also we pay rent to a yard so we are trying to work out how much he owes me for parking in our yard while working for us and the times he used our trailers they need paying for and also we tipped some of his loads that have never been paid for