All what was already said makes sense.
The first solution that came to my mind is:
- Ask people to pay: you personally, call the highest manager you came across and naively asked if they don't pay you because they don't like your work or in general respect the people working in your agency => the chance accountancy is messy vs. dishonest is very high, a top manager can fix this
- externalize this problem to a company whose job is to get invoices paid so you can focus on what you do best. To cover their fees, include in the payment terms that you wiull charge fees in case of late payment.

serena
-