Bad Internet

Since I got my AT&T internet I have had nothing but problems. No matter what we do we do not get the reception we were told we should have. Download speeds don't even register on a speed test. I called tech support and it was escalated and a ticket assigned. Every time I have called I can get NO information about the ticket and my service has not gotten any better. Is there anything I can do? I am getting ready to pay my second bill with no access to internet via wifi or a coax cable.