The last time I encountered similar problems from an ebook purchased from Barnes & Noble, I complained to B&N, as well as leaving a 1-star review that pointed out the bad condition of the ebook, and got a refund. (The book not only had horrible errors, and far too many of them, but it was missing the last page of its ending!)
I'd also contacted the author, who sent me the final text, and said he'd forward my complaint to the publisher. And I contacted the publisher--the one entity that should fix the issue--from whom I never heard a peep.
I'm just finishing another book by the same author and publisher (I bought them together), and which is turning out to be almost as bad as the last book. I'm about to do it all again.
