Adams Window Cleaning

Armageddon is upon us repent of your sins.!?
Or maybe not actually!

The last Greenhouse I did the guy shorted me $300... I've had many customers hop in and help with the greenhouse. I think all customers should. It gives them a sense of pride that they can get from being part of the final build. And this is a voluntary thing that happens. But that doesn't allow you to short me $300 at the end because you helped and donated a few 8 ft 2x4s. And then you're take my 6 10-ft 2x4s off my trailer. I had already lowered the price on this greenhouse $500 because I was trying to get it sold before Christmas. Plus they added on a stained glass window. Which added on about an hour and a half of time. Plus we had to level out greenhouse on some skidboards the guy had.... And that added on another 2 hours... I told the guy it was okay. But honestly it really was not... I guess where I'm at is the more I think about it more I feel like I got taken advantage of. And this is the second time somebody didn't pay me all the money. Any suggestions on what I can do about this for future reasons not the current situation....