My wife and I recently purchased a 30 year old house in far north Dallas that we purchased with the intention of doing extensive renovations. Since we were moving back into the city from the far northern ?burbs? we thought that it would be a good idea for our peace of mind to install security cameras. The small medical practice at which I am employed had used Single Source to install security cameras in our office and our office manager recommended them. I meet Chris at the new house just as the remodeling was getting underway. He appeared personable and professional when I met him. He tried very hard to sell me an alarm monitoring service with home automation with a 3 year contract however, my wife and I both declined since we both shy away from long ?term contracts especially where new technology is involved . Nevertheless, the security camera package he offered looked reasonably priced and the cameras , from my very cursory research, looked to be of good quality,so, I made an appointment with him to install four cameras around my house as well as a dedicated DVR. Chris requested half of the money up front for the system. Typically I don?t pay for anything up front however, Chris and Single Source were known entities to me since they had done work at our office so, I went ahead and paid the money upfront. The house was under extensive renovation when Chris and his crew showed up and they installed the cameras in short order. However, given that I did not have internet service at this time and did not have a monitor in which to confirm that the system was up and running as advertised I delayed the final payment. I scrambled to get the internet up and running so that the technicians from SS could come back out and get the remote features up and running and I wanted to get a monitor so that I could actually see the cameras in action. I got the internet set up and I made an appointment with Chris to come back out to get this finalized so that I could be confident that I was getting what I paid for. Chris mentioned final payment to me several times and I freely admit that I was putting him off because I know from experience that once someone gets final payment the motivation to work out any residual issues drops to near zero. And the reality is, the 1/2 payment most likely covered his out of pocket expenses so I felt it was reasonable for him to await final payment. Finally within a couple of days of the final install Chris called me on my cell phone. I picked up and he demanded that he receive final payment that day or he would not be able to come out to complete the work. I told him that I was not comfortable with this since I would like to see everything working to my satisfaction before cutting him a final check. He advised me that he would not come out to finalize things until he received the final payment. I told that I had worked with many, many contractors over the years and hat I had never been pressed to pay in full before I was satisfied that everything was completed and that I was 100% satisfied. He told me that the install was completed and he wanted his final payment that day. And technically he was right; it was completed but I didn't purchase a DVR and cameras as decorations and at this time they were little more than decorations to me because I was unable to see them in action. He was unrelenting so I told him I was going to pay him but I was very displeased and uncomfortable with the turn that this was taking. I told that I would take care of it that night ? which I did. He then advised me he would need payment for the final install /configuration which was scheduled to be done in a few days? before he would come out. I asked, ?you want payment for work that you haven?t even done?? He said, ?Yes?. I asked if this was typically how he did business and he replied, ?it is for customers that have a history of slow payment.? This statement made me laugh. I advised him that I would happily find someone else to finish the install and that in my history of three home remodels and dealing with countless other contractors I had never been treated this way. And furthermore, my wife and I have virtually perfect credit scores and neither of us have ever not paid ANY debt in our lives. I have to admit he left me seething for days. I honestly don't remember EVER having anyone treat me like that before. I suspect that SS was having a cash flow issue and they were desperate for cash; that is the only reason I can think that someone would treat a customer that shabbily. The monitor was hooked up by a third party and they configured the remote settings and it works great. It is unfortunate that Chris and company couldn't have been more patient so that this relationship could have ended on a happy note. And also, my wife and I did about $85,000 in renovations to the house - all of the contractors were paid promptly and we all parted on good terms. My error was (1) not checking Angie's List prior to picking a contractor and (2) starting this process without having internet service hooked up and without having a monitor available at the day of install. However, I think that SS should have been savvy enough to realize this potential issue and either brought a monitor or suggested that we postpone the install.