Fortunately I only had this problem once, and for me, the way to resolve it was first, with the client. Nagging, explaining to them that if they do not pay, I will sell their invoice to a invoice collection agency, that, if they choose not to pay will affect their credit rating and reputation blah, blah.
The trick is to do this in a serious way, but not overly confrontational and to be clear that all it takes for them is to pay the invoice.
After 6 months of this dance, I said, enough is enough, and initiated the procedure of finding an agency, and then, lo and behold, they paid.
In retrospect I should not have waited 6 months, but your learn with experience. =)
Fortunately I only had this problem once, and for me, the way to resolve it was first, with the client. Nagging, explaining to them that if they do not pay, I will sell their invoice to a invoice collection agency, that, if they choose not to pay will affect their credit rating and reputation blah, blah.
The trick is to do this in a serious way, but not overly confrontational and to be clear that all it takes for them is to pay the invoice.
After 6 months of this dance, I said, enough is enough, and initiated the procedure of finding an agency, and then, lo and behold, they paid.
In retrospect I should not have waited 6 months, but your learn with experience. =)