Comment Unfair and Deceptive Business Practice (Score 1) 562
One of the cardinal rules of contracts is that words are given their ordinary plain meaning. This rule is applied within the context of the transaction. If words have a usual or customary meaning within a particular industry, then that meaning is attributed to the word used. If you want to depart from that rule, you have to provide a definition in the contract.
Hard drive manufacturers got into trouble with this principle when they quietly redefined a megabyte to be equal to 1,000,000 bytes instead of 2^20 bytes like everyone was used to.
If I had AT&T as my service provider, I would be complaining to the Federal Trade Commission alleging this as a violation of Section 5 of the FTC Act. I would also be complaining to my state's Attorney General alleging a violation of my state's consumer protection laws.