I received a letter back from AT&T regarding the FTC complaint I had filed, typical form letter of "we are throttling anyone on unlimited data plans after 3 GB or usage and we always had the clause saying we could" which they pointed to.
Here is something I found interesting. When I had data use carry over from another day prior to the end of my billing cycle they told me it can take up to 3 days to see it show up. But you can bet that once I hit the 3 GB cap they had it throttled within minutes. -- "So, Lone Starr, now you see that evil will always triumph because good is dumb."
I'm glad I'm not the only one who noticed that. Only, get this: The data is already timestamped on the AT&T site (where I took the screenshot), so 'it's already in their billing'... they're just reaching back for usage into the previous period: