I installed a Qsee system that this guy purchased himself for a gas station. I gave him a price to install all 8 cameras, I would supply the siamese instead of that thin premade crap, I would supply the power supply instead of the 8 transformers that they wanted to use, and I would warranty my installation for one year. When we were finished, he asked me to mount a monitor on the wall. He pulled the monitor out of his car. I told him that was not in the price, but I would do it for him. I asked him where the wall mount is and he said he didn't realize he needed one, so he sent his son to PCrichards down the block to buy one. He comes back with a flat wall mount so we install the mount and hang the monitor. He says he needs it to turn so he can see the monitor better. I told him that his son purchased a flat mount and not one with an arm. His son said the one with the arm was too expensive and he will buy one online and install it himself. So, I asked the owner to give me my money and believe it or not, he refused to pay me because he couldn't see the monitor! I explained to him that the monitor wasn't even in the price and I even installed the one that his SON just purchased and I didn't even charge him! He said, no, the job is not finished, and what good is it if he can't see the cameras. I told him that he can see them on his computer AND his phone and the monitor wasn't even part of my deal. Than, he says that I am taking advantage of him and I didn't finish the job. I looked at my helper and I said to him, I will still pay you for the day, don't worry, but start ripping down all the cameras and cutting all the wires. The owner asked me what I'm doing and I said since your not paying me for the work that I did, I'm not going to give you an installation. All of a sudden, he said OK, I will pay you.