Why does ATT allow their customers to be scammed?

6 weeks ago after talking to customer service I was asked if I would listen to an offer from an ATT partner, wasn't sure what that meant so I said ok. Transferred to a third-party vendor who offered me some free channels. She said that I could get all of the other channels that I didn't already have for free for three months, and then after three months I could keep them for $20 a month. I said sure why not and didn't think much of it when I never saw a change in my channels. Fast forward to next billing cycle and Voila! I am being charged almost double my bill for several things I never authorized. I never agreed to a protection plan for $10 a month, or a sports fee for $8 a month, or a changed channel package for $40 more per month. Almost $60 in charges were on my bill after agreeing to view so called "free" channels. Never did get any extra channels. My question is this. Why does ATT allow this? I can't be the first customer to get scammed in this manner can I? After debating the validity of these charges for a half hour with someone I barely understood, I was told I had to pay the increased bill no matter what. I would get credited on the next bill for the extra charges but I am told I have to pay them. I can't afford to do that! Literally! So what happens when I can't pay the extra cost? Then I'm charged a late fee! This is absurd and can't be legal. I have filed a complaint with consumer affairs and BBB is next. I am filing at every consumer protection agency I can. And how do I talk to someone I can understand? I have more questions and want answers as to why this is allowed!!??!!