The precedent has been set many moons ago.
Avdata took a non payer to court...his bills, like those of other users contained all sorts of errors..ie the total amount was incorrect.
I think Avdata have changed their business model and pushed non-payment issues onto the airports. I had a late payment reminder which simply stated that failure to pay will result in the relevant airport being notified. I suggest they only pay airports when they've been paid (potentially not legal but thats by the by) and if you don't pay, they simply tell the airport that you haven't and let the airport try and cost recover.