When you get promised one rate and charged another, it’s frustrating. When it happens to thousands of customers getting service from the same company all at once, it’s probably a sign of a systematic problem. And one report now says thousands of AT&T and DirecTV customers have been complaining about exactly that for years.
When CBS News went digging, it found more than 4,000 complaints against AT&T and DirecTV (the two merged in 2015) over the last two years relating to overcharges, deals, and promotional pricing gone awry.
https://www.consumerreports.org/consumerist/att-directv-reportedly-overcharged-thousands-of-customers/

If you have been deceived by your cable company, you may be entitled to compensation.