I may have bad news
Ebay sellers are notorious for selling not legit copies
MS has began issuing updates to detect cracked copies. I think you may have been taken. If not I hope another comes by that knows how to solve the problem.
Unfortunately, I have seen this before and it is not kind. You may want to call MS, to verify that the number is not legit. Try it this way Activate Windows 7 by Phone
I will offer any help that I can, just post.