One thing I'd like to add.  Since my issue with that client, I started requiring all techs and clients to fill out a satisfaction survey before the techs leave.  I actually used a white paper from CEPro for the template.  

It includes everything from wire "neat and tidy" to screens cleaned, internet functional, blah blah blah.  

Maybe put one together for yourself...that way if something like this happens again, you have a signed document that he was happy when you left.  


It takes an extra 10-15 minutes at the end, but it covers your ass.  It's amazing how big people's balls get on the phone or online, but when you are standing in front of them they're nice as pie.