[Evans, Marv]

Quit doing everything on a verbal basis, you'll get screwed. Document every conversation you have & can remember including date & time, and start making a paper trail. If things end up in court, you need substantial proof of who said and did what, where, and at what time. The contractor has already said he would do one thing & subsequently changed that. I also hope you had a written contract for the work. In the end, you could probably get an independent organization of some kind to come in and assess the quality of work if necessary.