Having this same problem. This seems like an extremely poor way to treat people who've been around since 1.0 and are giving you a 2nd chance.

I ordered the digital CE from amazon, went to add it to my account and ended up with a 2nd service account. Amazon is saying they don't give refunds for digital downloads, so I'm out of luck there.

There was a support page where you could go if you accidentally added a service account, and request they be merged, which I did... but I'm not holding out hope. They really need to fix this somehow, and make it right. Telling people who've ALREADY bought a collectors edition that they're SOL and need to give you ANOTHER $20 to get what they already paid for is unacceptable.