Best Artificial Turf Installation in Austin TX

First off I want to start off this review by saying Justin the owner of ATX lighting seems to be a very nice guy he was always respectful and seemed to be honest and upfront. My reasoning for this rating is because in the very beginning I told Justin that we had a limited amount of funds and I needed to know the total cost upfront. So we agreed on a set amount, I also like to state his guys were good guys, very respectful and professional. So we gave him half of the total amount upfront and agreed to pay the remaining when the project was completed, when they were almost done Justin came back to me and told me I needed to pay for materials now. I told him and reminded him of our discussion and that I thought it was unfair that he was now going to try and charge me for additional cost when we had agreed on a set amount, he stated this is the way it always works and I told him that that's not true.  
I told him this wasn't my first rodeo, I'm a retired maintenance  superintendent and handled many many contracts and never unless you had a submitted change order were you allowed to just pad the end of the bill, but I agreed to pay it.  I told him I was disappointed but I wanted to get the job completed, he then proceeded to tell me that he now was not going install the outdoor fan on our open patio because he was offended that I was accusing him of something which I never did, he also stated he didn't want to have to buy a special tool and the special tool that we talk about is just a long extended drill bit.  I just can't imagine an electrical contractor doesn't own one of these. His guys had already cut a hole in our ceiling but did not install the brackets or the wire, he did deduct that part off the bill. The only thing I can say if you do business with ATX lighting demand that everything is written out on the invoice. Because I can show you mine and nowhere on the invoice does it state that the price of materials will be added later.