Unprofessional Techs/Leave work unfinished

We continually are dealing with this company to finish instillation of a new air conditioner in our house even though we've paid in full the amount owed for the job. On the customer receipt, it mentioned "Payment due upon completion" so we didn't have to pay until they were done. The problem is, since the beginning of August, when they initally came 'till now, they've displayed unprofessionalism in my household. The first time they came, it took all day to install and then, I was told by my significant other that they needed to come back to finish. My significant other told me they said they would call before showing up. That didn't happen, the guy showed up without calling. I confronted him on that and he blew me off. Instead, talking to my significant other, he said something about finishing up because "she's mad". I was even more angry and told him of course I was upset because of his unprofessionalism. The confrontation caused my significant other to get in between me and the tech, known as Billy. So there was an argument there. Billy gets all mad and says "I don't take this from nobody" and he prompts my significant other to sign a receipt and pay for a job that Billy didn't finish. Billy said he'd return to finish another day. Guess what, he never did. So, we waited a week. After I tried to call (getting a snappy customer service woman on the phone who didn't have time to listen to my complaint) my significant other had to call to get someone out here to finish. They did call before coming, but then tinkered around and eventually said they needed another part, a thermacouple to go on the heater. They left again, and we waited another couple or so weeks for them to call back and finish what they started. We finally call the company to tell them that we were told they would call us when the part came in. We haven't heard a thing from them. First, let me say that to get someone to come out, first we have to talk to a customer service person who then forwards your request to someone else to call you back. Then you have to explain again the situtaion to that person who can dispatch someone to fix the problem. They keep sending the same unprofessional people out here. Anyway, after reaching someone, we were told that someone would SUPPOSEDLY come and finish tomorrow. How many times must a customer track down people in a company to get a job done? And we have paid them! This company, as a whole, is disrespectful to its clients. There is no professionalism exhibited with the techs OR the customer service staff. Avoid Jordan Air Inc. if you want timely, satisfactory work done. I am just plain irritated at the way they've dealth with my significant other and I and I want the job to be finished and for some respect to be afforded towards their clients.

*UPDATE!: Today, 10/23/08, my significant other and I found out that the pilot light has gone out and the heater may be faulty. My boyfriend called Jordan Air back up to have them come out to investigate. He was told he would be called when the company would send someone out. AGAIN, no one called, they showed up on a whim. I answered the door and asked again why no one called. The person in charge was again, Billy. They asked in response, "Excuse me?" I told them it was unprofessional. And they started to leave. I told them they needed to finish what they came to do. My boyfriend came to the door and started to follow them out and placate them to come back. I went back out later and told them they need to be professional and not act like I'm the one with the problem. The tech said something like, "You are talking to him, he's the boss, you aren't talking to me." I told them I'm talking to both of them. I told them they needed to get their communication cleared up with their company and not show up here whenever they liked. Soon after, Billy, clearly agitated said, "Oh go to hell, bitch! Go ahead, report me." I again, stayed strong and told him and his tech how pathetic their company was. I was shocked at the words coming out of Billy's mouth. After I said my peace and told Billy he should not be calling me names, how "professional", I stormed off, having enough. I hear him say as I left, "Don't let me catch you in the real world." A THREAT!!! I didn't turn around, but he obviously threatened me. I don't know who to contact to file a complaint as the company doesn't have its act together anyway and I don't know who is in charge. I would HATE to find out this Billy guy is the owner of Jordan Air, Inc. I want this man REMOVED from this company. This is beyond the pale!!!