Just sent a pretty forceful sounding / legally threatening email to a client that still owes me a couple of grand. 4 months overdue invoice, all kindly worded follow up emails totally ignored. Spoke to him on the phone a few weeks back, said he'd pay by the following week but never did. Just taking the piss now, and I'm angry.
Give me my money, then they're getting blacklisted for good. There's more work to be done for this client (and I'm letting them think things will continue) but I've decided I won't be doing it. I don't want to work with people that have zero respect for what I do. I have the authority to say no, take your business with maybe payment elsewhere, and I plan to use it.