Fed up & thinking of leaving AT&T - over a month of unresolved problem

I had a landline and internet (Uverse) installed the 1st week in June. Some of the phone features require online completion, which is where the problem is. The pages where I must do the set up for the phone features has technical difficulties/errors, which wil not allow me to set up and use the phone features. Sometimes voicemail will work, other times nope, like I do not even have it at all. I have made calls for help with this since it was installed, with no acceptable help. The guy who installed my phone and internet even came back out to try and help, but he could not as the problem is in the website and has nothing to do with me, my phone or my computer. I have been told it was that I lacked the intelligence to set up my phone features, so the rep did a computer share and then he too ran into the problem, then proceeded to tell me   I needed a new computer as mine is out dated or to uninstall my OS and re install it. My computer is less than 3 months old - and runs Windows 8.1! I had another rep yell at me for waking her up, telling me that when I call I am reaching people in the Philipines for service and it is the middle of the night there, was only 2:00 PM where I am, then hung up. I have been told that some one from the IT dept will call me back the next day, no one did. I've been told it will be resolved in 48 hours on 3 different occassions, nope! All I get is lip service, mainly. I've been credited $30 for June and for July, however in doing so, I lost the $200 gift card that I was promised when I signed up for service and had it replaced with $50, which is still in limbo as to whether or not I will get it. Here are some screen shots of what I am dealing with, just in case some one reads this and knows what to do.