Was it dust or what? I have never seen that type of 'crud' before...
I have been threatened, cursed at, you name it, I've taken that to be part of running a business. I have heard the Better Business Bureau threats before, funny thing is the business I do some work for has received awards from them. I got a Emergency Service call one day and I paged on of the A/C technicians right after the call. And then that customer ended up receiving the "Final Notice", that I sent out 2 months later. The customers that promise early payment for quick service were the ones who caused the business to have 25,000 abstract dollars. I don't even wanna talk about stupidity in the Real Estate business, appraisers are crazy, and so are environmental health agencies that we have to take crap from....
And, yes that's usually the way it works out...