Just "communicating better" is not a reasonable response to making such a dramatic change in how much money you charge someone. If I tell you I'm going to punch you in the face, that doesn't make the punch acceptable behaviour.
Cloud services that pull this kind of bait and switch deserve to be ridiculed and lose lots of business over the negative PR. Cloud services that unintentionally pull this kind of bait and switch but then don't make it right or provide meaningful support deserve no special treatment.
From the GGP and some of your other comments here, it seems like you are arguing that communication is the main problem here rather than the change itself. Sorry if that was a misunderstanding.
Cloud services that pull this kind of bait and switch deserve to be ridiculed and lose lots of business over the negative PR. Cloud services that unintentionally pull this kind of bait and switch but then don't make it right or provide meaningful support deserve no special treatment.