When people ask me what I like most about window cleaning, somewhere near the top of my list is "totally stress free."
Over my (many) years, I've had surprisingly few situations like this, and each time I've taken the "line of least resistance" i.e. walked away.
Lie is too short to waste chunks of it persuing revenge against the people who are, probably, professional complainers. You may eventually get the boost of seeing them having to toe the line, but the cost to you in stress, worry, blood pressure etc isn't worth it. (Unless we're talking 100's of pounds here)
I had one who asked me to clean his soffits, fascias, guttering, frames and windows. I did what he asked, and made a very good job of it :
. He had to go out, so he gave me a cheque for £40 (the agreed price)
Later that day my wife rang me to say he'd been on the phone saying he'd never seen such bad workmanship, the job was dreadful and he wanted me back there immediately.
After I'd finished for the day I went back to se what the problem was. Now his story was that he'd asked me to wash down all his white paintwork and his double garage doors.
Totally untrue. He knew it, and so did I.
I didn't waste more time on him - I tore his cheque up and stuffed it in his top pocket.
I said: "We both know what we agreed, so we both know you're just out to cheat me. Let me save you any more lies, here's your cheque back, I haven't the time to waste on scum like you, I've got hundreds of good, satisfied customers to keep happy."
He didn't know what to say, and I didn't wait for him to get his breath back.
I still do the house next door, and if he's about when I arrive to do it he runs into his house and shuts the door.
We've just had another one: A new job canvassed by Rounddevelopers and passed to our franchisee. He did the job but the customer wasn't in so left a "windows cleaned" ticket. Still not in when he went to collect so left a "sorry to miss you" ticket.
Second time round - job done again, still not in - "windows cleaned" ticket left with request for two payments. Went to collect, they denied all knowledge, even though they'd had proper printed quotation. Refused to pay. Pointed out we knew the wife's name and mobile number, so how come if they'd never heard of us?
Still denied any knowledge, so I advised our man to forget it, and told him you will always meet the odd scumbag but it's not worth getting ulcers over it.
For every sh*t there's a thousand good ones
Cheers,
Ian