Many others are in your position of feeling forced to pay for an unnecessary upgrade to 5.5 (simply to qualify for CS6 upgrade pricing) after Adobe's ill-timed backflip on CS3 and CS4 customers upgrading to CS6.
According to John Nack and Jeff Tranberry (both Adobe employees) there is hope if you contact Adobe Customer Service.
"[Update in response to comments below: If you recently purchased CS 5.5 and have questions/concerns about that order in relation to this upgrade announcement, please contact customer service so that they can assist you.]"
In addition to what John has said, take a look at this thread which describes a user's successful complaint: http://forums.adobe.com/message/4416650#4416650
I think the key here is to not give up and keep escalating.
Hi chaps, good of you to respond, I really am getting peeved with this, I haven't got time (I need to work to pay for Adobe's extortionate upgrade costs) to spend hours on the 'phone to some call centre where the guy doesn't seem to understand what I'm complaining about and really just wants to get me off the 'phone and I just get passed around "... please can I put you on hold for a few minutes ... " is ringing in my ears !
At one point he said that he needed to ask his supervisor but wouldn't put me through !
I call Customer Service twice and was told I would get email by May 25th and could provide nothing else. Well no email and will have to wait till Monday. Really BAD Customer Service!!!