AT&T Door to Door Sales Reps

What is AT&T's standing on the dishonesty of the door to door sales reps? My mom has a bill that is almost $600 because the rep told her they would prorate her and start her on another plan. Not only did her internet get suspended, but he did not bundle her package (tv and internet) as he said he would and now she is getting the runaround. Two more reps (who have only been working there for 3 months) came out to try and assist her, neither were on the same page. Both kept interupting one another and had conflicting things to say. They spoke more of how the forms were filled out sloppily. Are you kidding me? All in all, they gave us no resolution and they themselves were unable to get a hold of anyone at AT&T. Something needs to be made right here. No one is taking responsibility for the lack of customer service and even more so, the fact that my Mom was taken advantage of.