I had a case recently with an ex-customer who owes me a fair chunk, but I cannot, and probably will never, get my money from her. She treats workers like her personal slave, and I sacked her off when I had had enough (not soon enough as I really try to see the good in people but she had gone too far with her mickey taking).
She saw me cleaning a few doors up, and called out to me to come over. I waved and called back 'OK'. When I finished the house I was doing, I loaded up and drove off.
Felt great!
I am back there this week. Looking forward to it.
John