VMware Fusion 5 was release before the latest apple hardware that is having an issue, so although unfortunate it's not necessarily VMware's fault per se! You can't hold a company responsible for hardware that is produced after the software was and while I'm sure they'll fix it unfortunately they're concentrating on the next major release and will probably work the fix into a 5.x release afterwards.
As far as wanting your money back I can tell you that because VMware Fusion is, as many of VMware's products are, available for a free 30 day trial so one can make sure it meets one's needs before purchasing it's doubtful you'll get your money back.