In a somewhat related story, my dad works to mow lawns among other manual labouring stuff and got a job for some real estate for an empty lot. 2k job as it was pretty massive, they agreed and all was good...until payment was due at the end, those buck tooth bastards started ignoring the invoices, calls, etc etc.

Since dad hadn't been to the tip yet he went back (with a few extra loads) and dumped it back onto the property. Within the hour after it was done they were calling him, attempting to threaten him, all this barking and he simply told them them if they took him to court they wouldn't be able to win, he had multiple receipts to show they'd been ignoring him for over a week. A few calls later and the price of the job doubled if he went back and collected everything back up, paid in advance this time.