If you bought it from a 3rd party site that sells stolen keys you're out of luck. They're bought with stolen credit cards and the charge backs financially hurt the developers.
To give you an idea of how big the issue is, game developers are loosing thousands of dollars to schemes like this: Example
You're literally better off pirating a game because at least then you're not charging the developer.
Six years is a long time to do it though. I suppose from their perspective, you charged them money
while using their bandwidth so it has been a net loss. So I can understand why but I suppose at this point they may as well have let it slide because people will complain and there will be outrage even if it was justified if it has been 4-6 years since activated.