First of all, this is probably not the best place to report something like this. However, it is maybe the right place to complain about WotC customer service, since other gamers should be aware that WotC does not always handle its customers very well.
I also want to say that I found most of the responses to the original post to be appalling. I applaud Morrus for stepping in and saying something. Someone makes a very legitimate (at least sounds legitimate) complaint, giving us the specific details about what happened, and several people start treating him like he is evil for doing nothing more tha daring to complain about WotC. Shame on you. He also never said that he waited 6 months to notify them of the problem. He said there was a problem that was easily remedied and then he discovered 6 months later that there was an entirely different, though possibly related, problem.
Now, I shall call down your wrath upon myself by saying that emailing Wizards customer service, in my experience, is a waste of time. I have emailed them 3 or 4 times now with questions and concerns and received a response each time. A week later. A canned response that did not at all address my concerns or questions.
In your case, I think you should call them, explain it to them and tell them you want a replacement. Be sure to tell them you are happy to send them your current copy for an exchange. If they will not do it, then you should come back here and tell us how terribly they treat their customers.
As a piece of advice, you are probably better off purchasing online from someone who makes an effort to deliver things in good shape. Amazon packs their books quite well. Most game shops do as well. Though, in this case, it might not have mattered.