AT&T Throttled on an unlimited plan Dallas, Texas

AT&T's throttling of unlimited internet customers is outrageous and I cannot understand why the PUCs and class action lawyers have not gone after them.  You sign up for unlimited internet, you pay the money monthly, then they cut you off full speed when you exceed some varying limited data amount in a month. Really I did not care till my son experienced it tonight.

I have 4 AT&T lines with unlimited data. My wife and I use virtually nothing, and the kids use quite a bit. But typically 2Gbs a month. Today my son got a nastygram text saying that he was using a lot this month and would be throttled at 5Gb. At this point he has used 3.5Gb. I did not listen to him properly and called AT&T to complain. The guy said that they now cut at 3Gb. So I expressed my extreme displeasure. After the call my son pointed out that the text said 5Gb not 3Gb.

So I called back and got some girl who told me that AT&T's computers were down for the next 2 - 4 hours (what, they don't keep their customer support computers up at 6pm? Maybe not when they get complaining customers on the line)... Anyway, she said that for LTE customers (like my son's phone) the limit before throttling is 5Gb and not 3Gb but she could not look into it because... yes the computers were down. So I told her I was fed up with this and that I had signed up for unlimited data on 4 lines, now they were cutting one of them off at 3Gb but it was meant to be 5Gb and should of course be infinite. 

Anyway, this is a scandal and a total ripoff and no one amongst the 300 million people in America seems to care or be able to do anything about it. Where can one find some legislator who is not getting reelection money from AT&T, or PUC member who is not being entertained in Vegas by AT&T, or a lawyer who is presumably not getting free ATT&T phone service to go after this pseudo monopoly? Even the AT&T guy I spoke to said he thought it was wrong of them to do this when I put it to him that if he were in my shoes he would be hopping mad - I hope the poor fellow still has a job when his boss listens to our call... he must be the last honest worker at AT&T for sure.