Complaint - Worst Customer Service - Need Help Resolving Initial Installation Problem

I am having extreme trouble getting my AT&T/Direct TV service setup per the initial agreement. I negotiated to have service in 4 rooms (DVR Accessible from all 4 rooms). When the Initial Technician showed up on 8/25, he only had 1 DVR and told me that I could either cancel the install (because he only had 1 DVR) or he could finish the current install and then I could call AT&T and have them create a new work order to have the other 3 boxes installed. I agreed to the second option because I didn't think it would be that much trouble to have the other 3 boxes installed. After the Technician left I called AT&T and placed the work order for the other 3 boxes to be installed on 10/6 (arrival between 8 and 12). I took off work on 10/6 and waited for the Technician to show up but no one showed. I called AT&T frustrated that I took the time off work and no one showed up and was directed to a manager who assured me that he would resolve the problem and we scheduled the work order for 10/14. On 10/14 no one showed up. I got back in touch with the same manager who couldn't believe that no one showed a second time. Long story short, this same thing has occured on 10/20, 11/3, and 11/17 and now I can't get the manager or his supervisor to call me back. I now have no idea how to get this resolved and am appaled at the customer service I have been provided. I have all the employee names and IDs that I have worked with and all the email confirmations, I just don't have any idea how to escalate this problem to someone who is actually going to be able to resolve it. Any idea who at AT&T I can talk to or email?

Thank you.